Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0c644a28bb94325…

MALICIOUS

PDF

81.5 KB Created: 2021-04-01 05:23:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 4dc12fc01125a3768105ec3516b72a32 SHA-1: bfd8a02d77d54857e3d214432b72ab93f9f66028 SHA-256: b0c644a28bb9432587ccea5d15d86ceb679c0041cd4dff14bf71cccc91f0d635
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO manipulation tactic. ClamAV and ML classifiers identified this PDF as malicious, specifically as a phishing or trojan variant. While no scripts were directly extracted, the nature of the link farm suggests it could be used to distribute further malicious payloads or lead users to phishing sites.

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
  • 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://pelibifir.ru/aws?utm_term=clasificacion+de+los+numeros+reales+ejercicios+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4485711/normal_605264321876f.pdfIn PDF document text
    • https://cdn.sqhk.co/lebapivi/he59hck/ice_cream_maker_cuisinart_ice_30bc.pdfIn PDF document text
    • http://scotiaenlineape-personas.com/menijipujamogineboxadub1lxvk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374983/normal_5ffb0e89b2eef.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425737/normal_5fe5502d57814.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378153/normal_603b701a65829.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368972/normal_5fe4809c335ff.pdfIn PDF document text
    • https://cdn.sqhk.co/xuwolegu/ensgfZy/chat_19_american_grill_scarsdale.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369664/normal_60111a71848fd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369168/normal_5fd9cadf97081.pdfIn PDF document text
    • http://bestcreditcheck.info/998563854325oq5i.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481831/normal_5fcf8cdd44941.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406497/normal_60524fccb59f9.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/xisakazelelinim/sesimefuxeju.pdfIn PDF document text
    • https://377d1c6c-8747-407e-9a0d-bb8234813250.filesusr.com/ugd/f0b1fd_829506d636d6444dbfe71377a527dbb7.pdf?index=trueIn PDF document text
    • https://f1ddcea9-c323-452c-a4d3-aaefec61e50a.filesusr.com/ugd/defd8a_cfbf6836c90843308c269e1f19b12cc0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xuzakob/banewowakevowigovut.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e553.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE553 5280 bytes
SHA-256: 667e9381df8e1ae8053dd713529157359be0ea0818b9c3b9b7c6ce0806982e94
font_01_sfnt_off0000f733.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF733 12444 bytes
SHA-256: 25f4d93c1b9d80e979f299b2ded544619719c10c4d784484428bb9f6aea96566
font_02_sfnt_off0001203b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1203B 16416 bytes
SHA-256: e6c3f4158e390b5b9f121b5fcfdcab91e5cfb4d6901e5873788ef30696d60d55

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