Malicious PDF — malware analysis report

Static analysis result for SHA-256 0711c65097b9e32e…

MALICIOUS

PDF

84.9 KB Created: 2020-12-04 22:00:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: fe69949b7ef1941e69264f5cb11063a5 SHA-1: 5f94907cf7549491c8c216f6884a744270bffad7 SHA-256: 0711c65097b9e32efc832ab4002df73d0daa1a3041d2874a27eb9885375074af
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 hosting services, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URIs are indicative of an attempt to redirect users to malicious content.

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://trafftec.ru/123?utm_term=parallel+lines+worksheet+grade+9 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4409998/normal_5fb5dc1ca928a.pdfIn PDF document text
    • https://xoraxabaxid.weebly.com/uploads/1/3/2/6/132682630/bf0768bc9a84a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368752/normal_5f895c92be6c8.pdfIn PDF document text
    • https://dewejudinasul.weebly.com/uploads/1/3/4/7/134702466/67e33391e8.pdfIn PDF document text
    • https://luwobidope.weebly.com/uploads/1/3/0/8/130814225/46812b02aa08.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369632/normal_5f9387d1df64d.pdfIn PDF document text
    • https://fabedajigunud.weebly.com/uploads/1/3/4/4/134480588/19c60745ad1d33.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404488/normal_5fc986d54e623.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382201/normal_5f992c6346b8b.pdfIn PDF document text
    • https://momibugu.weebly.com/uploads/1/3/4/6/134674353/ferorejen.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f1f251b-dee3-4fde-98c7-5c5fe64d16a5/one_minute_manager_book_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b51f9301-0817-4d14-85c8-af0fc2201aa0/jejojitinipuxib.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc29eebabaecd33182d3b3b/t/5fc40cf9e18c5c478e79ba77/1606683898330/teams_that_thrive.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe32191972c46e3c699a3d/1606300186293/running_with_the_buffaloes_sparknotes.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00011265.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x11265 28120 bytes
SHA-256: 8c1ae491ae7cac38780576cdf64773e70502ca92c5c60b43aae6273e21ace522
font_00_sfnt_off0000d9d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D6 5400 bytes
SHA-256: 43527d79346b4c25dbd5ebfa90a01eb7ddf33f00e40788cdb05ca1754e5218c6
font_01_sfnt_off0000ec3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC3C 12120 bytes
SHA-256: 3b6b3394a700c48518c435e3f9ed53ef20cd82845e85e71fecbf7dd0ab754d62

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