Malicious PDF — malware analysis report

Static analysis result for SHA-256 e85ee252cbf70be3…

MALICIOUS

PDF

77.3 KB Created: 2021-03-29 14:42:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: b41adc607dbe38121add077b0f78edff SHA-1: 7bd45bd09f60a21cce7f7dc8bbb95b3a0771932e SHA-256: e85ee252cbf70be3539d2494b20d1fe1a60cb5f369e205e2fdf0a87e23e64d02
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, identified as a link farm, with many pointing to disposable hosting services. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The primary function appears to be redirecting users to potentially harmful content via these embedded URLs.

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://nipisod.ru/award?keyword=ccie+collaboration+written+dumps+pdf PDF link annotation
    • https://deremufirig.weebly.com/uploads/1/3/4/8/134854029/nisuxenejobo.pdfIn PDF document text
    • https://cdn.sqhk.co/dugelabomaw/y6ggEgd/9417936132.pdfIn PDF document text
    • https://cdn.sqhk.co/nisifowisom/XziaijR/chinese_fishing_vessels_galapagos_islands.pdfIn PDF document text
    • https://cdn.sqhk.co/xafogatok/getjajc/56559569198.pdfIn PDF document text
    • https://gozaperirij.weebly.com/uploads/1/3/1/1/131163841/zopafer.pdfIn PDF document text
    • https://cdn.sqhk.co/nowavutu/iifLia5/botijovofu.pdfIn PDF document text
    • https://binikefesomeb.weebly.com/uploads/1/3/5/3/135386190/2103410.pdfIn PDF document text
    • https://cdn.sqhk.co/tokarikadez/jbvqmVb/minecraft_building_instructions.pdfIn PDF document text
    • https://murovufusefafa.weebly.com/uploads/1/3/5/3/135331463/504404.pdfIn PDF document text
    • https://cdn.sqhk.co/vemegunir/idhjshg/74228908480.pdfIn PDF document text
    • https://cdn.sqhk.co/jalotenabo/iirhaig/pameredubure.pdfIn PDF document text
    • https://cdn.sqhk.co/mofokamibe/GX9h7hh/67602788139.pdfIn PDF document text
    • https://tazugusalasuxof.weebly.com/uploads/1/3/4/5/134581133/83d040f25bf831.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nozasilexezut.rf.gd/sea_animals_colouring.pdfIn PDF document text
    • https://s3.amazonaws.com/bewibiwat/dewomigetotariba.pdfIn PDF document text
    • http://goderava.epizy.com/70565232948.pdfIn PDF document text
    • https://s3.amazonaws.com/muwomapotumugi/89815821972.pdfIn PDF document text
    • http://nazonuretowu.epizy.com/deductive_and_inductive_research_approach.pdfIn PDF document text
    • http://lezebotetojezaz.epizy.com/online_android_code_editor.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_off0000ee1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE1A 5440 bytes
SHA-256: 4e24e18bf30a06f4f0eb24aee5873dfc8bdc7fb2eef9158aef050dfdda686583
font_01_sfnt_off00010087.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10087 11572 bytes
SHA-256: 0530361b3093885c321dee2ca732bc135c0a28a3499cca26fdb03ba12003f06a

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