Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b2d66f5fb881396…

MALICIOUS

PDF

70.3 KB Created: 2021-02-17 16:17:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 2d9743f18330ef5bc35d9b2eeb820035 SHA-1: 79a93b4fb9ed1e7d67b0bb90b7ed9563589500ed SHA-256: 1b2d66f5fb88139656f376504d6f2d71c9a85529ff86f22720ea649e0a46847f
194 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV. It contains a large number of external links pointing to various PDF files hosted on disposable domains, indicating a link farm likely used for SEO manipulation or to distribute further malicious content. The presence of multiple external links and the use of disposable hosting are strong indicators of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://druttle.ru/strik?utm_term=winchester+model+12+pump+action+bb+gun PDF link annotation
    • https://pepesavujol.weebly.com/uploads/1/3/1/0/131071240/4537472.pdfIn PDF document text
    • https://pibusabet.weebly.com/uploads/1/3/4/6/134695111/e0ceced74bd2.pdfIn PDF document text
    • https://wukavogitebiw.weebly.com/uploads/1/3/5/9/135964288/rupizifuval.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393641/normal_5ff3fbb222de2.pdfIn PDF document text
    • https://tetunabirudav.weebly.com/uploads/1/3/0/8/130874278/6658674.pdfIn PDF document text
    • https://cdn.sqhk.co/nojedevatas/iigcWpo/52456863630.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419851/normal_60247aadd733f.pdfIn PDF document text
    • https://pipewasages.weebly.com/uploads/1/3/4/0/134017488/pokewujubisak_votonutoritezud.pdfIn PDF document text
    • https://kuvomudoriri.weebly.com/uploads/1/3/1/4/131406544/8422800.pdfIn PDF document text
    • http://tadenexibegujam.22web.org/palujosifozojefanigofe.pdfIn PDF document text
    • http://tubunasozejut.22web.org/dixofozebulasak.pdfIn PDF document text
    • https://cdn.sqhk.co/tisufupujeli/gf2GaDO/pet_dog_wallpaper_download.pdfIn PDF document text
    • https://gegilegaf.weebly.com/uploads/1/3/1/3/131383227/luzuguwuzikinasu.pdfIn PDF document text
    • https://sidilatadafexu.weebly.com/uploads/1/3/1/1/131164021/biwijusa_xurebedogi.pdfIn PDF document text
    • https://cdn.sqhk.co/muxigatatini/jghiVie/lakonipulazawuwolo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374519/normal_5ffc57f8a7829.pdfIn PDF document text
    • https://kepijifawobi.weebly.com/uploads/1/3/5/3/135388201/8905527.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501027/normal_6006b1a2e8e1a.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/wekibik/osrs_brutal_black_dragon_guide_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/rexogeguxosix/5045623042.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_off0000d1fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1FD 5824 bytes
SHA-256: d6d641369cd1024d5e56dc058d94e54a22d899d6ac0169cbe87ab84ff325a7f1
font_01_sfnt_off0000e5b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B2 10620 bytes
SHA-256: cc3642b60a5d03b639fc0f5fe09b7ea52afdc8d877fba26211180be7daf92ad5