Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a9d52aff35f1f4d…

MALICIOUS

PDF

160.7 KB Created: 2021-04-04 05:13:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: a1cb695cd3eb865612798c5d94e21f54 SHA-1: 59a62b87547426080b2575a5d1480bfa702bcc89 SHA-256: 3a9d52aff35f1f4d6796905c2aad0a92c4c7245919d5915b0c6736e7475e4f20
286 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1566.002 Spearphishing Link T1059.007 JavaScript

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious. It contains multiple heuristics indicating phishing and credential theft, specifically impersonating Microsoft. The document body, though obfuscated, suggests a lure related to 'Comptia security sy0-501 certification study guide pdf', likely to trick users into clicking embedded links or downloading further content. The presence of external URIs and a link farm heuristic further supports a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://susutabum.weebly.com/uploads/1/3/4/4/134464128/4805851.pdf.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://zajinet.ru/strik?utm_term=comptia+security%252B+sy0-501+certification+study+guide+pdf PDF link annotation
    • http://homeolimp.com/what_does_it_mean_when_there_is_no_dial_tonexoppn.pdfIn PDF document text
    • http://rollernefrit.xyz/model_3_owners_manual_europeng0xb.pdfIn PDF document text
    • http://zesivez.iblogger.org/83408144698.pdfIn PDF document text
    • http://govegejemoluf.iblogger.org/lumog.pdfIn PDF document text
    • https://susutabum.weebly.com/uploads/1/3/4/4/134464128/4805851.pdfIn PDF document text
    • https://tonukujile.weebly.com/uploads/1/3/1/8/131857071/tebipe.pdfIn PDF document text
    • https://ponekuxu.weebly.com/uploads/1/3/4/7/134747949/zifodalajomopu.pdfIn PDF document text
    • https://tuwureliw.weebly.com/uploads/1/3/4/1/134108737/wibixazogedofozuxana.pdfIn PDF document text
    • http://bettyloustintruckbbq.com/gowimajemarezitexjn7r9.pdfIn PDF document text
    • http://rajedat.iblogger.org/digital_marketer_value_journey_worksheet.pdfIn PDF document text
    • http://jeruxawi.iblogger.org/zupilasaf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/0830fbad-4a14-4441-9abe-ca5a4c7aa5b9/google_translate_chinese_characters_not_showing.pdfIn PDF document text
    • http://lojagajojib.rf.gd/filtrage_analogique.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6448c2a1-b1f0-4f2f-9cd9-1d01af06e28b/givivezepetejagokel.pdfIn PDF document text
    • http://tititogejeda.rf.gd/15541619080.pdfIn PDF document text
    • http://gumajixu.rf.gd/6135369002.pdfIn PDF document text
    • http://sodunaxa.epizy.com/govusadudemekadigebike.pdfIn PDF document text
    • http://naziniri.epizy.com/13203374415.pdfIn PDF document text
    • http://pisozew.rf.gd/86434659759.pdfIn PDF document text
    • http://widafasamuj.epizy.com/rugby_strength_training_program.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e34c42f-e3b5-430f-9cf4-856cb62697fe/23385233455.pdfIn PDF document text
    • http://bowupezik.epizy.com/xukumaxuxunipado.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001fa9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FA9E 6424 bytes
SHA-256: 4455747fda9ac97410526ac3fee3ca643cc61cb592146befb7df79af2604d95b
font_01_sfnt_off00020a80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20A80 5800 bytes
SHA-256: 133ae91b3a0da54c831156388830762d637f352f98bfb61aea0a2d2d12db1358
font_02_sfnt_off00021e39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21E39 5756 bytes
SHA-256: acb1220a1884d355687b4c774927258eefa3d08b42e00f49842c1c6bc2e311fd
font_03_sfnt_off000232fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x232FD 12500 bytes
SHA-256: 7f62de74ab48ac6813f6ce67f5f816e3f1d4b4de011fc085f5c4c1f02d8c7c18
font_04_sfnt_off00025da1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25DA1 16324 bytes
SHA-256: 165de1734ae066c9a0bce27141cfcf16ab8121477340e9b80e3dfd7988481a40