Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d0bb1614c16c054…

MALICIOUS

PDF

75.5 KB Created: 2021-01-25 05:54:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 49c92da2d683dba95bf4d2b5e0da8afe SHA-1: 245a616b00d468def7a39e1a3ed5dc618bfa6078 SHA-256: 3d0bb1614c16c054d5e4a3e5ffb5240835dcf16e79179434ca467bcaee37c8ac
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier. It contains a large number of embedded links, many of which point to known malicious redirectors or disposable hosting, suggesting a phishing or malware distribution scheme. The ClamAV detection also confirms its malicious nature, specifically flagging it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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.
  • 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://crophysi.ru/123?utm_term=sbb+key+programmer+user+manual In PDF document text
    • http://dunetetemob.22web.org/bcbs_of_texas_medicare_advantage_provider_manual.pdfIn PDF document text
    • https://xomivevisavuwog.weebly.com/uploads/1/3/4/8/134852088/revaridun.pdfIn PDF document text
    • https://lemusudavigi.weebly.com/uploads/1/3/5/3/135395292/d5a466.pdfIn PDF document text
    • http://gedawuxofawu.iblogger.org/35596117958.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489969/normal_600555acb8b4d.pdfIn PDF document text
    • https://seronenufides.weebly.com/uploads/1/3/1/4/131407086/438510.pdfIn PDF document text
    • https://sejelenowoloza.weebly.com/uploads/1/3/4/5/134518320/filivepesukanif_lifuru.pdfIn PDF document text
    • http://batezelokev.iblogger.org/ad_connect_version.pdfIn PDF document text
    • http://kuzojud.66ghz.com/28010733170.pdfIn PDF document text
    • https://mitojebani.weebly.com/uploads/1/3/2/7/132711961/8682518.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jigiwema.epizy.com/xavise.pdfIn PDF document text
    • http://tivekanudoz.rf.gd/fresh_pomegranate_mask_sheet.pdfIn PDF document text
    • http://pipovafalalum.rf.gd/acc_travel_assistance_form.pdfIn PDF document text
    • http://tikokowekujuw.epizy.com/56289795266.pdfIn PDF document text
    • http://kodadus.epizy.com/tabel_asmaul_husna.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
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA11 5548 bytes
SHA-256: 2d1f161ca7695a2a88d5c6e672a6310a3465994c7a794352a2424d1febfccfde
font_01_sfnt_off0000fce4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE4 10656 bytes
SHA-256: 51745ee54fa96dcd6566d2ddf94f54932e427195935231b94e8b356ad5fb2d70

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