Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc174e1bbef2a05c…

MALICIOUS

PDF

74.5 KB Created: 2021-06-08 17:56:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 797aefe36af3e103df2b237f88ae7ba2 SHA-1: d22637f059b156f102c20bbcfecdc066dae1f5db SHA-256: fc174e1bbef2a05c7ec09f7481e1bace58c7e512d8f62d23ed341e2caef837cf
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are hosted on disposable domains, suggesting a link farm or phishing campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://irlanc.ru/pbw?utm_term=bismarck+germany+from+blood+and+iron+worksheet+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4421473/normal_602e75174eeb5.pdfIn PDF document text
    • https://duxupapumi.weebly.com/uploads/1/3/1/8/131856851/6879636.pdfIn PDF document text
    • https://jazejuvo.weebly.com/uploads/1/3/4/4/134439384/watetitupogo_xolesude_kizewavalozexup_sewiruvajasisuk.pdfIn PDF document text
    • https://rulafusojuxibaw.weebly.com/uploads/1/3/4/2/134265871/36297af6c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380384/normal_604829e652c79.pdfIn PDF document text
    • https://notalajamuneno.weebly.com/uploads/1/3/1/3/131378915/tugomigulam_lagoxuzewa_safasebesususov.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417807/normal_6052fa8de07c9.pdfIn PDF document text
    • https://kaxitojuwomig.weebly.com/uploads/1/3/5/3/135302818/00a80.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481162/normal_600844cb1a765.pdfIn PDF document text
    • https://jamafijuzu.weebly.com/uploads/1/3/1/4/131437216/taravu-nutuxunewika.pdfIn PDF document text
    • https://mutovowi.weebly.com/uploads/1/3/4/8/134862221/raladojabuvi.pdfIn PDF document text
    • https://waguwejulunesu.weebly.com/uploads/1/3/5/3/135301122/rapimoxab.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486548/normal_5fc754abb3d84.pdfIn PDF document text
    • https://zupikadi.weebly.com/uploads/1/3/4/6/134667234/9913731.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421350/normal_5fce22e0d33b0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xugatun.pbworks.com/w/file/fetch/144662319/zavaxas.pdfIn PDF document text
    • http://mituxap.pbworks.com/w/file/fetch/144845043/bopalogelejolidijanesuzu.pdfIn PDF document text
    • http://vatojorisa.pbworks.com/f/3dtuning_apk_premium.pdfIn PDF document text
    • http://kapetipubi.pbworks.com/w/file/fetch/144426288/total_war_warhammer_2_how_to_install_mods_steam.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD74 5884 bytes
SHA-256: 4d7ca95176217ddeb8aaacd7e35d9bbccfcdc2ccc4610b065eff700cb219dbf8
font_01_sfnt_off0000f165.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF165 1800 bytes
SHA-256: e9a5a1f6ed95b1e3669933bb00002ad32a1708c3e0b735191cad5e02368a6c7d
font_02_sfnt_off0000f9f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F2 9960 bytes
SHA-256: 6b0ebd5dada2e0f1353f7eaead9e6b7587e3cb9a9217ee732ec9c15cca2bacd6