Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bf00150f36aed1b…

MALICIOUS

PDF

66.7 KB Created: 2021-04-06 00:57:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: db06065d320c9517153e9371f23b5151 SHA-1: 382453f4d7b4d40af434036d98ac3f5206f8d300 SHA-256: 5bf00150f36aed1b93e4b72a886c0ee6d1a418882e2a34dfc1aa9bae8ecb3867
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting it is part of a link farm. The ClamAV detection and ML classifier also indicate maliciousness, with ClamAV identifying it as Pdf.Phishing.Trojan. The embedded URLs point to various PDF documents, some of which are confirmed benign, but many remain unknown, increasing the likelihood of malicious intent such as phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://jumiwimov.ru/wix?keyword=bill+nye+populations+video+worksheet PDF link annotation
    • https://tiwebusimevadeb.weebly.com/uploads/1/3/5/3/135346158/4713492.pdfIn PDF document text
    • http://medazuxa.mywebcommunity.org/brain_busting_lateral_thinking_puzzles.pdfIn PDF document text
    • http://pusapev.scienceontheweb.net/bcom_law_uj.pdfIn PDF document text
    • http://tulumiv.medianewsonline.com/bargaining_theory_in_international_relations.pdfIn PDF document text
    • https://zuseluxutiv.weebly.com/uploads/1/3/4/6/134686448/balibuluxetapipadel.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/bifamomove/what_hands_to_double_down_on_in_blackjack.pdfIn PDF document text
    • https://f72b89be-0fa6-41ee-8162-331329ef78ce.filesusr.com/ugd/95089d_b3d8dd6a746e451696da245a7e1f0ef6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/woxorojero/broiler_chicken_farming_guide.pdfIn PDF document text
    • https://f26e6bca-ce10-4524-9610-ed5ef7c8d48b.filesusr.com/ugd/ac8c68_48ba8c99c984414ebf48748a0ae83b2d.pdf?index=trueIn PDF document text
    • https://8f1ef4f7-3f23-41ef-a3d6-4e5873a175a2.filesusr.com/ugd/d318ce_3cda4dbf7990420188fb432ef1bfa018.pdf?index=trueIn PDF document text
    • https://ed0f7819-48b4-4c0d-9119-93de03d81b9c.filesusr.com/ugd/e481ce_f06d2aaf0ed744ca8090fb2412c33fb3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lunojol/50458307570.pdfIn PDF document text
    • https://s3.amazonaws.com/gofilafixu/what_does_the_term_a_quick_study_mean.pdfIn PDF document text
    • https://80b2a579-f9ed-4aa0-b91a-ac3c8973c086.filesusr.com/ugd/353d00_e420a9dfe2ab4e8190a39203037167ed.pdf?index=trueIn PDF document text
    • https://245df057-3761-468b-8bc4-2c9c6734f7c7.filesusr.com/ugd/06c8e1_27e7b67eac604d3283df943b405cdf81.pdf?index=trueIn PDF document text
    • https://e5baaea7-7007-41de-9367-4ebf3ed55875.filesusr.com/ugd/8e1900_548476b171ac479fb83d39bcf02bfd9a.pdf?index=trueIn PDF document text
    • https://cb38ef3f-1f2c-4622-8962-dca261660167.filesusr.com/ugd/3ae201_1d362054af7549918914b59ab3f9505b.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_off0000c77b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC77B 5412 bytes
SHA-256: 4426091fd03828d6f46262e0edec8a02e27dedbedc656ed3111dee97c70261a0
font_01_sfnt_off0000d9f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9F9 10060 bytes
SHA-256: c6b91477bc931a67bb1bd11a011733cef7984db09c97fb12fab24ec162c411d6

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