Malicious PDF — malware analysis report

Static analysis result for SHA-256 44c78dfa749899cf…

MALICIOUS

PDF

71.4 KB Created: 2021-06-07 01:50:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: fe59c61af76b433513ad943af998b3ac SHA-1: 2199f23aa4b60b95d6a47e331116b32782acb120 SHA-256: 44c78dfa749899cf1c60889459e408dc3b1561cc497e87234c8fbc88a7169319
194 Risk Score

Malware Insights

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

This PDF document functions as a link farm, directing users to numerous external PDF files hosted on various disposable domains. The primary lure appears to be related to driver downloads, as indicated by the 'utm_term' parameter in one of the extracted URLs. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://infrive.ru/pbw?utm_term=nvidia+high+definition+audio+driver+vs+realtek PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4386828/normal_60634f671a460.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4375694/normal_60b6e752e47e6.pdfIn PDF document text
    • https://vevenefokuje.weebly.com/uploads/1/3/0/7/130775565/8d0d8f48ef.pdfIn PDF document text
    • https://povilaromegew.weebly.com/uploads/1/3/4/4/134486615/1347851.pdfIn PDF document text
    • https://kajuzenutojaso.weebly.com/uploads/1/3/4/6/134631714/wamipakuteg_wakofubomo_kuvojebuguwi.pdfIn PDF document text
    • https://jivexine.weebly.com/uploads/1/3/1/3/131380908/b751c35f598991.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405440/normal_602ad7be4b170.pdfIn PDF document text
    • https://sosuwijanifoval.weebly.com/uploads/1/3/4/5/134515130/ceb5a3d61b5e57.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4502817/normal_5fe0e76ee17a6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f01e20a-cc6f-4121-b180-4824e7735cac/18134119300.pdfIn PDF document text
    • http://zuxanoguk.pbworks.com/w/file/fetch/144712728/wulumudawamaxexefakebim.pdfIn PDF document text
    • http://vulazojab.pbworks.com/f/how_to_buy_doge_dank_memer_premium_free.pdfIn PDF document text
    • http://vananizi.pbworks.com/w/file/fetch/144497445/nupifoxawupadanejiziwe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/368155d2-5b2b-4e7f-b471-d10746f82e6d/vibarakevopibidifoxe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a501e4ff-3bc1-4771-8e16-531f6008a491/muwazaligunukij.pdfIn PDF document text
    • http://vowujepojez.pbworks.com/f/74870125501.pdfIn PDF document text
    • http://gogoporiwo.pbworks.com/f/dokemedufipoj.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_off0000dac0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAC0 5264 bytes
SHA-256: 088cede773b4ed238e99e6bee0ad5d0e06a73d1012b2f321af27e82dfcbbd087
font_01_sfnt_off0000ecb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB3 10504 bytes
SHA-256: c5c8d4eb146686d0022b36c58aa1948f5f9bc0f6e5ba0adb5acaa8601bf8c36d

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