Malicious PDF — malware analysis report

Static analysis result for SHA-256 83a8f6480a398092…

MALICIOUS

PDF

76.9 KB Created: 2021-06-01 05:32:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 4e49909913c1e3daafbb564b39a46c32 SHA-1: de78cf3b3419f2c1942b8c2187d8449c13238fff SHA-256: 83a8f6480a39809233ae9407b96b5fa2d334321c5a0732df1bf5109501051e07
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links pointing to disposable domains and link farms, as indicated by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. The ML classifier and ClamAV also flagged this PDF as malicious, suggesting it's part of a phishing or SEO spam campaign. The embedded URLs are likely used to redirect users to malicious sites or to distribute further malware.

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://gimoguvi.ru/123?utm_term=basic+bookkeeping+pdf+free PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4489033/normal_5fc99e45bda87.pdfIn PDF document text
    • https://vilukenuxe.weebly.com/uploads/1/3/2/8/132814007/82e334.pdfIn PDF document text
    • https://fowanexi.weebly.com/uploads/1/3/4/6/134648222/jidinaf_paxomebi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372378/normal_6038f3c30a231.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417207/normal_6069460280569.pdfIn PDF document text
    • https://jadufebifov.weebly.com/uploads/1/3/4/6/134627690/sifozigoxovaxiv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454977/normal_6033b79f35bdf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456114/normal_60552270518db.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393020/normal_5fecbef86ec18.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412379/normal_6023052d62406.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vadibun.pbworks.com/w/file/fetch/144438606/how_to_get_robux_in_roblox_for_free_2020.pdfIn PDF document text
    • http://jijagenaneke.pbworks.com/w/file/fetch/144439179/tibewoxal.pdfIn PDF document text
    • http://zekodunu.pbworks.com/f/xekudekivesesaxiliwet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81159fc8-9102-4a59-81ec-e3bde9013604/94753810575.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64624aaa-356d-41cb-a47d-bed9daa0b73d/new_troy_bilt_lawn_mower_wont_start.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_off0000eff0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF0 5544 bytes
SHA-256: f6226685430d18196e1b1934f50b1c08b8f55606a77985eeed0a8f889e9d92b6
font_01_sfnt_off000102dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102DD 10816 bytes
SHA-256: ec2fa7a351ce07c4c836025783625071dd5bf248e87bc6e0d75f323132431fac

Open this report in the interactive analyzer, or submit your own file for analysis.