Malicious PDF — malware analysis report

Static analysis result for SHA-256 92cfb406a90f5951…

MALICIOUS

PDF

92.8 KB Created: 2021-03-13 23:36:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 8382778eeef89c09468e78ba58a82ea1 SHA-1: 999b06603862439abb312e1205a524501724632c SHA-256: 92cfb406a90f595122738776db2d4f5669f247818d79b3d3d2d544a5453e3e05
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable hosting, suggesting a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://seumenha.ru/award?keyword=rotork+pneumatic+actuator+pdf PDF link annotation
    • https://wovodolu.weebly.com/uploads/1/3/4/8/134861979/7571546.pdfIn PDF document text
    • https://zosufolukariv.weebly.com/uploads/1/3/4/7/134755865/6186213.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383334/normal_600ae3b56fa7e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366385/normal_6037dd347535c.pdfIn PDF document text
    • https://kodirovotosin.weebly.com/uploads/1/3/2/8/132814250/fagewodugewege.pdfIn PDF document text
    • http://zefefiwova.medianewsonline.com/nofekilujudinureke.pdfIn PDF document text
    • http://zisuroto.mygamesonline.org/powerscore_critical_reasoning_bible.pdfIn PDF document text
    • https://sexuviruzimi.weebly.com/uploads/1/3/2/8/132814305/31fb683e6.pdfIn PDF document text
    • https://xudekumuf.weebly.com/uploads/1/3/2/6/132681038/9359916.pdfIn PDF document text
    • https://kofetasug.weebly.com/uploads/1/3/0/8/130874362/c313a5e0458c1.pdfIn PDF document text
    • https://dexasarejujevi.weebly.com/uploads/1/3/1/4/131454537/4323.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/kakef/10930859187.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/913afbf7-ea3d-4fda-8970-0638c057c569/aviation_weather_kodiak_alaska.pdfIn PDF document text
    • http://xemunebo.atwebpages.com/how_to_learn_physics_on_your_own_reddit.pdfIn PDF document text
    • https://s3.amazonaws.com/dojivewobasuval/65379165381.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33e659f7-a774-44e7-b38c-862908d2db62/337247489.pdfIn PDF document text
    • https://s3.amazonaws.com/neporezofov/zidasorosowemoj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/58aa3e42-7cc0-4b63-a89f-fc80965a2b21/what_is_the_best_inverter_microwave.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC3 18508 bytes
SHA-256: 2f933fba18bea3050479510852f94e895bb1dde343d91d3da0caf9cd12c42c24
font_01_sfnt_off000121ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121AE 5044 bytes
SHA-256: c3551414ad0532b8e2e7552c4da25fb8297a9a6c0f36d0dd5ebb4b8176142276
font_02_sfnt_off000132c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132C2 10832 bytes
SHA-256: 2f99d8c76cff3a9662060e05182d5c7508f0436b52cd57858b5218cf9efadca3
font_03_sfnt_off000157b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157B0 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3