Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf59fa627749746f…

MALICIOUS

PDF

81.9 KB Created: 2021-04-26 07:44:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 852084096079d33dd1d1eab42db3ca00 SHA-1: da92872215d36b6a626c55f8dfee4a44864a2b28 SHA-256: cf59fa627749746fc092bdfe463f5ffea0afe6da00f227ec414ad181db9e3e24
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://golowaki.ru/strik?utm_term=computer+architecture+and+organization+online+course PDF link annotation
    • https://silorofolukut.weebly.com/uploads/1/3/4/2/134265947/vesuroxojorelidire.pdfIn PDF document text
    • https://xazebuwojij.weebly.com/uploads/1/3/4/4/134467588/e2130efdbc800.pdfIn PDF document text
    • http://beritox.medianewsonline.com/fanogapogigupamo.pdfIn PDF document text
    • https://cdn.sqhk.co/wekababu/W3gg6ie/bubogedivigalamule.pdfIn PDF document text
    • https://cdn.sqhk.co/bareziwo/hbhbMgd/song_kabhi_jo_badal_barse_female.pdfIn PDF document text
    • http://lopitimew.mygamesonline.org/building_materials_mcq.pdfIn PDF document text
    • https://cdn.sqhk.co/fijajiles/xhjgcqS/t-_mobile_store_near_me.pdfIn PDF document text
    • http://zuvalasit.mypressonline.com/toner_para_hp_laserjet_pro_400_color_mfp_m475dn.pdfIn PDF document text
    • http://vadanunagirira.getenjoyment.net/sodojaboweduvowi.pdfIn PDF document text
    • https://kodivowu.weebly.com/uploads/1/3/4/3/134360374/92815ce34c1.pdfIn PDF document text
    • https://matomuzunoto.weebly.com/uploads/1/3/5/3/135389802/1018296.pdfIn PDF document text
    • http://didibemez.scienceontheweb.net/5315889568.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://s3.amazonaws.com/babuxufarizuxur/zofafeduju.pdfIn PDF document text
    • http://jizipok.rf.gd/32276851628.pdfIn PDF document text
    • http://wenulusevikofa.myartsonline.com/botaxozijerina.pdfIn PDF document text
    • http://nafopafilor.epizy.com/future_simple_tense_worksheet.pdfIn PDF document text
    • http://zemonipovop.epizy.com/gafupevafuzeduzidawudorod.pdfIn PDF document text
    • https://s3.amazonaws.com/tirimofufemukat/labitinifofefuw.pdfIn PDF document text
    • http://pijosufun.myartsonline.com/50909467849.pdfIn PDF document text
    • http://fataragoreb.myartsonline.com/55383648553.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1DA 5444 bytes
SHA-256: 6b1fae1c8cfed3cba603b03bfa90e6b2e8543768cd2245257c4d8062373fbce7
font_01_sfnt_off00010434.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10434 11100 bytes
SHA-256: ac56e67eed48be836b8b5bc0ff5f2eb37704648d8ff7a38652857dc11980ab94
font_02_sfnt_off00012a29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A29 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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