Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cbec95ac5431c84…

MALICIOUS

PDF

78.2 KB Created: 2021-03-09 11:35:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 053f7f46325f4092554c1c062f6d5319 SHA-1: 7c0a166b0a0c29d70a1a7593fe494ea1d90dcd10 SHA-256: 8cbec95ac5431c84975660946c55a2dcf9cf62523dd8a938b04f63b1e16c7127
166 Risk Score

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs and is identified as a link farm hosted on disposable domains, suggesting an attempt to redirect users to malicious content. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document may be instructing users to open a password-protected archive, a common tactic to bypass gateway security.

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
  • 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://soxebez.ru/123?utm_term=hide+navigation+bar+android+8 PDF link annotation
    • http://khareedforosh.com/planeaciones_telesecundaria_tercer_gradoboguj.pdfIn PDF document text
    • http://duplicwcnj.space/887790586553tap6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382772/normal_60032d7309d3f.pdfIn PDF document text
    • https://cdn.sqhk.co/namulofilox/dgh9Kji/41504503934.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478430/normal_5fdd5c525d4ec.pdfIn PDF document text
    • https://cdn.sqhk.co/goxobuve/gjAmLig/ocean_habitat_lesson_plans_kindergarten.pdfIn PDF document text
    • http://wekeb.space/jevizikuavxlt.pdfIn PDF document text
    • http://bigwin-1xbet.fun/budojizukoxurorif77n1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fulosobezur/rugapuwabowasapakede.pdfIn PDF document text
    • https://s3.amazonaws.com/kotenu/clarksdale_ms_crime_report.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5ab2b6c-11bf-4c4e-9ed7-1afabfef485d/nusilaf.pdfIn PDF document text
    • http://sezirinizisa.rf.gd/35321947086.pdfIn PDF document text
    • http://wuxininozikup.rf.gd/17335240676.pdfIn PDF document text
    • https://s3.amazonaws.com/liwafo/windows_adobe_reader_scan_to.pdfIn PDF document text
    • http://sitejaxikezo.epizy.com/6129588406.pdfIn PDF document text
    • http://vavagasaxifuja.epizy.com/agatha_christies_poirot_season_11_episodes.pdfIn PDF document text
    • https://s3.amazonaws.com/negonanopix/4517747441.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11bac343-e6d8-4c55-abaf-46101a9e23ce/public_relations_major_university_of_oregon.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_off0000f4e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E9 5136 bytes
SHA-256: 19c6fe512b21d9adce472377ef706854c2d53a232489175cabbfd5defa110267
font_01_sfnt_off00010671.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10671 11096 bytes
SHA-256: 6a793b9abe54e39a33bd0f514616956b9738c9504c3a7df95029963087a47e40

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