Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cb99bdd0e808a2e…

MALICIOUS

PDF

73.5 KB Created: 2021-05-20 15:14:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: ac5285776c1236262d1c2d50cdfa29a5 SHA-1: 65a0164344001746b8bad8d578d0e05342252975 SHA-256: 0cb99bdd0e808a2ed78d978afa2530824ddab710c1a01ac55e4744b6a019b15a
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9997

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=half-life+word+problems+worksheet+with+answers PDF link annotation
    • https://safubijob.weebly.com/uploads/1/3/2/6/132682970/c217232.pdfIn PDF document text
    • https://lemitixodage.weebly.com/uploads/1/3/4/8/134868200/e2b4df16.pdfIn PDF document text
    • https://lebabipiw.weebly.com/uploads/1/3/0/9/130968925/1b0a00c171fce.pdfIn PDF document text
    • https://jupaxegusuwe.weebly.com/uploads/1/3/5/3/135389123/rutufesemoto-woxanepux-silome-sinunefik.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427785/normal_6064cb8968907.pdfIn PDF document text
    • https://repadugudemi.weebly.com/uploads/1/3/0/9/130969496/9bfb2fc0.pdfIn PDF document text
    • https://raduwefun.weebly.com/uploads/1/3/1/1/131164260/6230914.pdfIn PDF document text
    • https://dubevatuw.weebly.com/uploads/1/3/0/9/130969539/wunisuzegej_bifimojozexe_kigime_bimisojenum.pdfIn PDF document text
    • https://xexidizufom.weebly.com/uploads/1/3/4/5/134508107/2427299.pdfIn PDF document text
    • https://romixizu.weebly.com/uploads/1/3/4/8/134887474/39eff8212100.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408983/normal_6017503402caa.pdfIn PDF document text
    • https://dafemiperufukoz.weebly.com/uploads/1/3/1/3/131379503/3984400.pdfIn PDF document text
    • https://zajuzazoni.weebly.com/uploads/1/3/4/8/134891144/wiwem_sizelilobub_rugodiburitiv.pdfIn PDF document text
    • https://zipenuwoku.weebly.com/uploads/1/3/1/0/131071258/5107873.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/kuxuxemu/kapipikuxanupogib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/812e96f5-1135-4b73-b0f0-092d20385d4a/how_much_do_pediatric_emergency_physicians_make.pdfIn PDF document text
    • https://s3.amazonaws.com/wexukufedepim/autocad_2013_portable_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b12138c-e27a-4e53-9e5b-bbbc5f39cf33/public_speaking_anxiety_tips.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23d1d82d-d6ef-4674-b904-1a41599e71a7/27239344523.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71ff1530-1bb8-4cb6-bea2-a0fcc23f1045/tabujibodegada.pdfIn PDF document text
    • https://s3.amazonaws.com/fuzafuzeruwit/jojivivazi.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFCF 5568 bytes
SHA-256: 4429328f0bfb6ee221963653d87f1428167858161da099d79203224319292ffa
font_01_sfnt_off0000f2a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A3 11064 bytes
SHA-256: 9dab6557a40d2a8f45b64fa79dc73202a631547f5d482e7a937b0568970eee49

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