Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b9d6d731e1fe2be…

MALICIOUS

PDF

73.5 KB Created: 2021-04-06 15:41:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 31668e982c1c4298bd1cff95c868a528 SHA-1: 357c45bc7b171543b97579d93652756ea9681e24 SHA-256: 4b9d6d731e1fe2be7ed290b3b23b649e09b4bcd148e59b1906d34627ae50a698
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://pelibifir.ru/strik?utm_term=the+pit+and+the+pendulum+1991+subtitles PDF link annotation
    • http://gesakif.iblogger.org/15028560662.pdfIn PDF document text
    • https://cdn.sqhk.co/marixefe/Iehfwjh/37167214160.pdfIn PDF document text
    • https://gupebuxoguwev.weebly.com/uploads/1/3/4/3/134381402/7520568.pdfIn PDF document text
    • https://cdn.sqhk.co/mibaforetu/cij2s4b/career_paths_medical_answer_key.pdfIn PDF document text
    • http://sosutisokalelul.iblogger.org/votikuzi.pdfIn PDF document text
    • https://pesakezered.weebly.com/uploads/1/3/4/7/134729162/ruvufatoziket.pdfIn PDF document text
    • https://cdn.sqhk.co/durotula/jjija38/robux_calc_free_new_icon.pdfIn PDF document text
    • https://zoxuzuxebexot.weebly.com/uploads/1/3/0/9/130969059/vuzuruzenibu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://234d5d8d-19c9-4cab-a884-dd0775662658.filesusr.com/ugd/fb7225_939ee72e3f004b6cbea7a810190d27c4.pdf?index=trueIn PDF document text
    • http://gumigojozupe.epizy.com/lejotus.pdfIn PDF document text
    • https://6739ca04-605d-4ff4-b4c9-4e5bd75a7819.filesusr.com/ugd/031dda_1f5632bd8cde4b0b8db88538964c99f3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nuxomigo/nulowiwobej.pdfIn PDF document text
    • http://fuzudad.epizy.com/gulijapokupone.pdfIn PDF document text
    • https://6c036dbd-b327-4678-b778-de8a2ee7bb50.filesusr.com/ugd/ed64d2_672cd653e2a842d1952a882e2290030b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jamuluvuvava/multiple_alleles_and_codominance_blood_type_answers.pdfIn PDF document text
    • http://tegewixu.epizy.com/76303189971.pdfIn PDF document text
    • http://ribezewipuzez.epizy.com/fasiv.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d346.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD346 5172 bytes
SHA-256: 4e18f76a0d2c6050fc88ab48acc692a0b35455185ca11e7eead43517a28f13c4
font_01_sfnt_off0000e4a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4A2 11080 bytes
SHA-256: 345e835e4895d96ee143df8210fb137bfbcdc425d5aaad34f50d346afc626be1
font_02_sfnt_off00010a96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A96 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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