Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bdd16467bbb47c7…

MALICIOUS

PDF

69.3 KB Created: 2021-04-04 14:43:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 07afd5b58c8de6c2bfd7bc60335f224f SHA-1: d7b8fe340d40e9d576444c481e66bad399bfe068 SHA-256: 8bdd16467bbb47c728ff247f2da06e7a005ddeac4ea78b43c149a99104e3d25f
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting services, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a spearphishing attachment used to drive traffic to potentially harmful sites.

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://xajibur.ru/strik?utm_term=how+to+calculate+expiry+date+in+excel PDF link annotation
    • https://tigibivimibi.weebly.com/uploads/1/3/4/3/134344299/sabogabowigem-kitewit.pdfIn PDF document text
    • https://cdn.sqhk.co/xokunafuse/jghchhZ/aaron_jones_fantasy_2020.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418180/normal_5fc6c9a66c28a.pdfIn PDF document text
    • https://cdn.sqhk.co/gikasiful/RHajaoM/aambala_tamil_movie_1080p_video_song.pdfIn PDF document text
    • https://sosalikibagog.weebly.com/uploads/1/3/4/8/134856993/riganukodubop.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495400/normal_5fe14ff5e5559.pdfIn PDF document text
    • https://wexemexaxixu.weebly.com/uploads/1/3/4/7/134709907/05d9b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374199/normal_5fcd0057b5a4a.pdfIn PDF document text
    • https://xisofapetuv.weebly.com/uploads/1/3/4/7/134747578/xiwefave-xatiti.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365602/normal_5fff263dbb63a.pdfIn PDF document text
    • https://cdn.sqhk.co/munuluxel/4agi3jd/crossword_clue_example_indicators.pdfIn PDF document text
    • https://cdn.sqhk.co/diratukuz/g84P2w9/erupciones_acneiformes_definicion.pdfIn PDF document text
    • https://sapemeke.weebly.com/uploads/1/3/2/8/132814969/zipofi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488580/normal_6050194a0ccb0.pdfIn PDF document text
    • https://cdn.sqhk.co/felodunom/EixgflF/live_cricket_match_tv_app.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://75a697d3-84f0-44cf-bab9-f05e37020c50.filesusr.com/ugd/7c3584_2b0bb297f401484282558efccc5f6677.pdf?index=trueIn PDF document text
    • https://c79dcb07-c1b1-4d84-a600-6417d8bf0f54.filesusr.com/ugd/edce22_c5f3528eb9684e05af0cc042f01944fe.pdf?index=trueIn PDF document text
    • https://4bf641bf-117a-4913-931f-55e49063997f.filesusr.com/ugd/5befcb_a99b3423abca4caaad60f3b8d9558a41.pdf?index=trueIn PDF document text
    • https://d934ed86-632c-4751-b35b-4303166f997e.filesusr.com/ugd/be0f55_3f0191c8a2e8403a8044dc6c2b66b3c6.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_off0000d0de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0DE 5112 bytes
SHA-256: 8609ec859c290af8bd69b8b2061c4c8f7717f9975bc45af82d36edbfa58f7ae4
font_01_sfnt_off0000e26d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE26D 10812 bytes
SHA-256: c983a7d98321987ac36c8b4c2ef8f46df63b2f380048004adca58e661c8c06f5