Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ad2b2b5d58c69d7…

MALICIOUS

PDF

72.7 KB Created: 2020-12-30 07:52:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 053f4c6843908707399676d0815c9f62 SHA-1: 440d17244aa121047c77f2c526b6add5c72fb15f SHA-256: 2ad2b2b5d58c69d743c49dab9c9a071dd26ace74d0e189be438fdeedd1bb23cf
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links to other PDFs hosted on various domains, indicating a link farm or SEO manipulation tactic. ClamAV and ML classifiers flagged this file as malicious, specifically as a phishing trojan. The embedded URLs likely lead to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • 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://trafftec.ru/wb?keyword=era%20sosial%20dan%20budaya%20pengajian%20am PDF link annotation
    • https://xufiwelak.weebly.com/uploads/1/3/1/1/131164558/5079628.pdfIn PDF document text
    • https://cdn.sqhk.co/jepipovi/10jjwje/791757919.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365563/normal_5f87c50a24f19.pdfIn PDF document text
    • https://cdn.sqhk.co/wezopexa/ggQ4Cjj/financial_reporting_books.pdfIn PDF document text
    • https://cdn.sqhk.co/mebinolopuf/5DXIhgj/lutugelujajukazavenowi.pdfIn PDF document text
    • https://federadedeladol.weebly.com/uploads/1/3/4/6/134626130/5046293.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474220/normal_5fe236815cf99.pdfIn PDF document text
    • https://mizunemaki.weebly.com/uploads/1/3/4/8/134850414/9064149.pdfIn PDF document text
    • https://bobazuforabi.weebly.com/uploads/1/3/1/4/131452976/e19fe8b4c852b.pdfIn PDF document text
    • https://jevavawawoj.weebly.com/uploads/1/3/4/8/134885319/2380840.pdfIn PDF document text
    • https://cdn.sqhk.co/sekigozujeme/Ugeihic/65378420436.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/bojafazes/48291158639.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_off0000df28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF28 5552 bytes
SHA-256: 5a215ca3946810e163f291c5440b23fc56c59ce2a9a2f74e503b2b6ea6ba65f8
font_01_sfnt_off0000f1fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1FB 10676 bytes
SHA-256: 3c52486bbe3c293fb7648ab0c0044bd5bcb6cfd5acff37e0079531ead0912f8c

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