Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7f0b15c2522437d…

MALICIOUS

PDF

71.5 KB Created: 2020-12-21 16:10:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 3f6148133598760c97aba755e2c5600a SHA-1: 1039b9a5382e5cb19b1b9b849b5752ca06c71eb0 SHA-256: e7f0b15c2522437d6334301cdca7bd0659a8468c6c17c4b9c1f70b6cbaef066f
186 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, with many pointing to disposable hosting services like Weebly, characteristic of SEO spam or link farm operations. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly suggest the document's purpose is to redirect users to other sites, potentially for phishing or malware distribution.

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://traffnew.ru/123?utm_term=south+platte+river+colorado+fishing PDF link annotation
    • https://gokajafiwewafij.weebly.com/uploads/1/3/4/3/134314986/zawijurakelu.pdfIn PDF document text
    • https://jotovaxawunujej.weebly.com/uploads/1/3/1/8/131856347/cb80bbad9a7.pdfIn PDF document text
    • https://bomazadoxu.weebly.com/uploads/1/3/4/4/134474586/7124cb45e845.pdfIn PDF document text
    • https://wegotutitupal.weebly.com/uploads/1/3/1/4/131453182/jepowibape.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416918/normal_5fa8b9cb34e4f.pdfIn PDF document text
    • https://lipowuripipu.weebly.com/uploads/1/3/1/3/131378852/637ae81d038.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426971/normal_5fddcbdc74398.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fdea684ff074777c984c22e/t/5fdef864f3f88b619f17fe71/1608448101059/football_game_2018.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b3e0f60-31c0-4790-a624-1a23c035814d/ec50_vs_ed50.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fdca98d9e7d8d17cbb96cee/t/5fdd186d4424484a2e2281f1/1608325229652/59996895207.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/32968f99-0829-4bb5-9559-89fefbd63473/ps4_free_monthly_games_may_2019.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc29fd4c14dfd36fefc97f1/t/5fc5a2332dd96f5918afe65b/1606787639459/34752701853.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_off0000d8f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8F3 5580 bytes
SHA-256: 6509519d764f57726ee57e490ec57f5a6971f69d3ae63e1e26de9cec4ad64de3
font_01_sfnt_off0000ebef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBEF 11096 bytes
SHA-256: 3916c7c8709643daae9448fe228657d54c8be54aaa59f1fd216cfee90f236a50

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