Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb9f9fbb82ef70bc…

MALICIOUS

PDF

79.6 KB Created: 2021-04-30 21:44:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 56402866961662d00296bd7543182ff3 SHA-1: 7199fc9fe0022d3d63dd41e65229301548540c21 SHA-256: fb9f9fbb82ef70bc81254166669f107e0a80f5a1c31671cefece76d757429290
126 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting and are likely used for phishing or to redirect to malicious content. The document body, though heavily obfuscated, appears to be a lure related to crime causation theories, suggesting a social engineering pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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 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/strik?utm_term=what+are+the+different+theories+of+crime+causations PDF link annotation
    • https://cdn.sqhk.co/tegatiwuwax/bE8jdij/harkins_movies_times_near_me.pdfIn PDF document text
    • https://cdn.sqhk.co/lilapanorup/UFotuJb/fudawu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366993/normal_5fce9d6375c0e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415950/normal_605efd69507f2.pdfIn PDF document text
    • https://cdn.sqhk.co/gewewoturila/idK8vib/97003449091.pdfIn PDF document text
    • http://defokozixeral.sportsontheweb.net/9569952742.pdfIn PDF document text
    • http://wutopezogegusi.getenjoyment.net/fedex_domestic_air_waybill.pdfIn PDF document text
    • https://cdn.sqhk.co/nogawevorus/r6RhcBm/pubasojedebubixidedivofaj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365659/normal_5fc64be88fa1f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418973/normal_6041ab43d4a93.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374024/normal_605a1038aa84e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://1fd079ea-3156-4ae8-a0b4-6153e0b529c5.filesusr.com/ugd/e66bf7_019fa5a21ce044b3851af1ea77924845.pdf?index=trueIn PDF document text
    • https://033f1a72-e514-447f-b44b-9d234b37386c.filesusr.com/ugd/f05202_a6268a1be2ab4682b3235c5b0e502a3b.pdf?index=trueIn PDF document text
    • https://7404da97-7fcf-4d5f-9d5f-3f8644e6773a.filesusr.com/ugd/35f767_bc6a8f971f4f4ea7b57f0db2527d7e3b.pdf?index=trueIn PDF document text
    • https://332892e0-6a2b-40ad-946e-e7c92c61c867.filesusr.com/ugd/3e5d97_012b1a5d936f43ca8f17ebe06161d8ef.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe4fd80f-aa9d-452d-bedd-d3bc2c74a49c/todobizedavikixibexolosup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/911662d4-80f7-4281-909f-2a57e4e93485/jutexagupazufejet.pdfIn PDF document text
    • https://s3.amazonaws.com/zabejuvijolu/hounds_of_baskerville_summary_by_chapter.pdfIn PDF document text
    • https://s3.amazonaws.com/bezutu/16766048550.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0cdd456a-c341-45d3-934c-d72d5ef58ed9/draconian_ritual_book_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c639f628-ebf0-4722-a76f-ab3665200b72/airport_express_a1264_setup.pdfIn PDF document text
    • http://tuminexozuvino.atwebpages.com/20516544725.pdfIn PDF document text
    • https://43081b45-6e48-4b43-b724-9328fda377ae.filesusr.com/ugd/26481d_21bfdf36e9bb41d39379edeec10d0eb0.pdf?index=trueIn PDF document text
    • https://bit.ly/3oArLi3In 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_off0000fbb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB4 5244 bytes
SHA-256: cb7b1eb3addd97bac5081b90beecb1efe19b84357f24118b4035897218800b68
font_01_sfnt_off00010d70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D70 10340 bytes
SHA-256: fafbaa169d32bde5a218898178962136c060478635238a8d5d9a472990f6979b