Malicious PDF — malware analysis report

Static analysis result for SHA-256 70fa96349d2a7bdc…

MALICIOUS

PDF

68.1 KB Created: 2021-02-18 19:11:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: d0cd9ad2d81770e7888a4d1dc0cc55f5 SHA-1: a990ecf8b2f142fe4affb6c473c805db11969b2b SHA-256: 70fa96349d2a7bdc921363f38650aa9f46891cfbeb0e079b0c4f26fbf7e1059b
226 Risk Score

Malware Insights

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

This PDF file was detected as malicious by multiple heuristics and a machine learning classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or redirection infrastructure. The presence of a URL with a 'utm_term' parameter implies an attempt to track user interactions, common in phishing or malware distribution campaigns. No scripts were extracted, but the overall structure and link farm behavior point towards a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 7

  • 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.
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://bologen.ru/strik?utm_term=where+to+find+the+model+number+on+a+stove PDF link annotation
    • https://bagopilijesab.weebly.com/uploads/1/3/1/4/131438775/pukatufikufaxenanu.pdfIn PDF document text
    • https://vijopafixav.weebly.com/uploads/1/3/1/6/131636601/d5b51191dd61d2e.pdfIn PDF document text
    • https://raminatu.weebly.com/uploads/1/3/4/5/134579417/a81f6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402504/normal_5fd5f2e77f658.pdfIn PDF document text
    • https://cdn.sqhk.co/feguzuvubut/hLNicie/prabhas_movie_collection_list.pdfIn PDF document text
    • https://vepemetamat.weebly.com/uploads/1/3/4/3/134354227/75f22a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411218/normal_5ff8ec97956aa.pdfIn PDF document text
    • https://waxutawuvesi.weebly.com/uploads/1/3/1/4/131455398/2906639.pdfIn PDF document text
    • http://leomannapov.com/benaxevafeleluvekonugi5ripr.pdfIn PDF document text
    • https://cdn.sqhk.co/sozimelizak/0iggyhi/31733020717.pdfIn PDF document text
    • https://cdn.sqhk.co/budajawisore/u4KjcGQ/lamosumiwegizolasiluxujug.pdfIn PDF document text
    • https://cdn.sqhk.co/zudatona/2Humyic/negisot.pdfIn PDF document text
    • https://cdn.sqhk.co/pemazekefise/cie1heM/naxej.pdfIn PDF document text
    • https://cdn.sqhk.co/guwuweri/69iegiH/8_ball_pool_hack_tool_v5._2.pdfIn PDF document text
    • http://verifybadgehelp.com/introduccion_al_estudio_del_trabajoipf4n.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4506170/normal_6007c82841eac.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422890/normal_5ff71b54bba84.pdfIn PDF document text
    • https://cdn.sqhk.co/bikegola/icpkijs/muwibumakovajiweda.pdfIn PDF document text
    • https://cdn.sqhk.co/fasazani/fKIMgdG/ta_express_nacogdoches_texas.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464052/normal_5ff854fbdad9e.pdfIn PDF document text
    • https://cdn.sqhk.co/sovokeduseb/egcggwN/teachers_assistant_pay_uk.pdfIn PDF document text
    • http://extraterrestrials.space/tangle_teezer_thick_and_curly_amazonej45g.pdfIn PDF document text
    • https://cdn.sqhk.co/mibupufek/aDie1s1/24044122934.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000cdab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDAB 5360 bytes
SHA-256: ab918896388a4d7c28960824c0422338de4de35cdca986e42ecfb5a9366c353b
font_01_sfnt_off0000dfca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFCA 10344 bytes
SHA-256: 9e63790c39a80c1f58f7d348a2807779c57dc6e01bc28d29c289dbb793732e36

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