Malicious PDF — malware analysis report

Static analysis result for SHA-256 4addfd4779863253…

MALICIOUS

PDF

80.5 KB Created: 2021-02-26 04:11:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: f7f279d4cfb13aab2cfd091cea9b2c56 SHA-1: 763593f0de9abeab6f53643d37a113855d4a847d SHA-256: 4addfd477986325372aa2520e737880c809752ec6ce9d57a3d00aa113c35a59f
186 Risk Score

Malware Insights

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

The PDF file exhibits characteristics of a link farm, with numerous external URLs pointing to other PDF documents. Heuristics indicate a high likelihood of malicious intent, specifically related to phishing and SEO manipulation. The ML classifier strongly flagged this PDF as malicious, and ClamAV also detected it as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to potentially harmful content.

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://bologen.ru/award?keyword=intel+dx58so2+bios PDF link annotation
    • https://cdn.sqhk.co/zisubiziwu/hgKKAkk/cnc_machine_metal_price.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460449/normal_5fda73d320ad6.pdfIn PDF document text
    • https://pudisemibupar.weebly.com/uploads/1/3/4/0/134096773/vofavoba.pdfIn PDF document text
    • https://xizuxikeg.weebly.com/uploads/1/3/0/7/130740292/3575761.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383797/normal_5fc62f9df352f.pdfIn PDF document text
    • https://vamotavobepud.weebly.com/uploads/1/3/1/4/131438348/4950882.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465556/normal_5ff38bc5377fb.pdfIn PDF document text
    • https://digeforoxega.weebly.com/uploads/1/3/4/6/134668277/rujemewa.pdfIn PDF document text
    • https://buxudirikebipur.weebly.com/uploads/1/3/1/1/131164004/8045278.pdfIn PDF document text
    • http://italysummer.fun/4221081324f46s7.pdfIn PDF document text
    • https://cdn.sqhk.co/merabuvi/jfjjihF/16327770451.pdfIn PDF document text
    • https://talunijepi.weebly.com/uploads/1/3/4/5/134599753/tozezino-zinunugoviku-rowopozuder-butavezowijomew.pdfIn PDF document text
    • https://cdn.sqhk.co/gusiloxi/UvhjTjd/69072033855.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457005/normal_60241209cac69.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off000100ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100EE 5108 bytes
SHA-256: 862f780df0de94a51d5688d5484d0473e8e6640c51e8553318510af01aae1674
font_01_sfnt_off0001126b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1126B 10240 bytes
SHA-256: 30b50bb2eb58f2bbb5af458e89a29630c0a834c683da49ae1334fff2d6ba3303

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