Malicious PDF — malware analysis report

Static analysis result for SHA-256 639f601c7ccde045…

MALICIOUS

PDF

83.4 KB Created: 2021-04-03 06:45:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: dd5d35b4f921e8c571d58dd981347862 SHA-1: 8869ccdda31129705105005301349efc6856b258 SHA-256: 639f601c7ccde045bf1c13fca53cb3fbda33c25c9df24c6eae359478fe856446
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://botokaw.ru/wix?keyword=deutsche+bank+championship+live+stream PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4402486/normal_605637b8a4b6e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486374/normal_5fc595e082c3e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449397/normal_6063b5bfedb46.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480758/normal_60146105351b5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450046/normal_6013492344fc5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://070488ba-e3d9-4c74-834b-445551f5513c.filesusr.com/ugd/fb83f1_fe1c468303c9458a826b9b5ed3da8074.pdf?index=trueIn PDF document text
    • http://dowisekek.rf.gd/jubejisaxetikapabaxukuser.pdfIn PDF document text
    • https://0cfe495c-9a5f-46a1-a5f3-fb21b6211bac.filesusr.com/ugd/7aabb2_63c1ef317bf04f23beab663e1e95bb7e.pdf?index=trueIn PDF document text
    • https://5c3e38fa-bf2d-4cda-bfdc-19e9a39f2227.filesusr.com/ugd/b3ada4_76a0c2442c9f4e9085214fbe5c51b01f.pdf?index=trueIn PDF document text
    • https://8964868a-aef6-4da0-9a9b-29de7c28e0c5.filesusr.com/ugd/b910ae_ec567a654d2745d98ae82b49ae19e6a9.pdf?index=trueIn PDF document text
    • https://f110cc6a-49d6-427c-9ab6-a3a4d323b004.filesusr.com/ugd/9e53d4_215b18fe87504c2e9a25597b9075ed0b.pdf?index=trueIn PDF document text
    • http://mogipenen.rf.gd/simple_biodata_format_for_job.pdfIn PDF document text
    • https://aee666f7-65d2-4416-8089-42e5bd85255d.filesusr.com/ugd/c4036c_2f683a990b4e463e94e8ed82a03f3cdd.pdf?index=trueIn PDF document text
    • https://82656f1f-dd0f-4426-89ca-c5688288f975.filesusr.com/ugd/56de54_93b99ce0863b454fb2780be3d1276007.pdf?index=trueIn PDF document text
    • https://937a8a2d-b41a-4163-aff8-eda6db263557.filesusr.com/ugd/21e6f2_a1df9d3c577949c6a3cb30ab2c33ab4c.pdf?index=trueIn PDF document text
    • https://0491f86b-060d-4f4a-be23-b0d01488777f.filesusr.com/ugd/faa7ef_9030731ff7e6443e89459977f682d66e.pdf?index=trueIn PDF document text
    • https://a21f0d7d-5fe0-4a99-a381-3b18266e0880.filesusr.com/ugd/6c313a_29020e8c368f4354a37ca2f7eea119af.pdf?index=trueIn PDF document text
    • https://69cf8a46-0d3d-4b71-8fd1-93df925da18e.filesusr.com/ugd/e4064d_da13a67130f1444885f8650c483a7624.pdf?index=trueIn PDF document text
    • https://6a9ecc2b-05c3-4056-8705-773ae6be8cdd.filesusr.com/ugd/7a359d_0fdf0419a7b747f4a284391aa387b712.pdf?index=trueIn PDF document text
    • https://83372c7a-1065-4b07-8284-b64562b46e84.filesusr.com/ugd/035489_edc12c21c4c848eaa8603eb9d40a7386.pdf?index=trueIn PDF document text
    • https://fad58b31-c538-4d3f-828d-7998eec853b9.filesusr.com/ugd/7e6083_138513593a514cb990c0a9060758236c.pdf?index=trueIn PDF document text
    • http://jenepopavuse.epizy.com/blank_invoice_template_excel_free.pdfIn PDF document text
    • http://validexa.epizy.com/alcatel_one_touch_pixi_3_3._5_manual.pdfIn PDF document text
    • https://245ae9ba-e923-43ed-bc11-30ed5d1acd78.filesusr.com/ugd/051519_66f558d8b3d44b4f8c4a30bde183ec3b.pdf?index=trueIn PDF document text
    • https://ccd4a2e6-63e2-4dcb-a02e-1ae1253dabcc.filesusr.com/ugd/059ff1_70cfa6eda0d6455eb114233e04c97790.pdf?index=trueIn 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_off0001098c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1098C 5436 bytes
SHA-256: ac8c6303aa662a1ecda5687d0a8eac9d15d71079ce5f5478d1cf0914464516da
font_01_sfnt_off00011beb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BEB 10476 bytes
SHA-256: 818706a6170c44ed46badf005d63e4f639c992455414e14a4bfdb1fce03f632a