Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d4002c1758ed21c…

MALICIOUS

PDF

76.0 KB Created: 2021-05-16 06:09:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 57b484ed62581d614b14d771bf331476 SHA-1: 2972dec4afdf9407d125a5334ca181e9adaa57c8 SHA-256: 6d4002c1758ed21c40ebe05b04254971cf3bd25a3b4a93fd02e661d9e91bf349
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting services, indicating a link farm designed to distribute malicious content or engage in phishing. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/strik?utm_term=metodologia+de+la+investigacion+sampieri+pdf+5ta+edicion PDF link annotation
    • https://kosazalosir.weebly.com/uploads/1/3/2/8/132815054/ladokomazolez_naxakaful.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462352/normal_6039547bf0dff.pdfIn PDF document text
    • https://jeraligasusuwaj.weebly.com/uploads/1/3/4/5/134528446/5241047.pdfIn PDF document text
    • https://modemogip.weebly.com/uploads/1/3/0/7/130776314/59f8b2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484107/normal_600eb0a287862.pdfIn PDF document text
    • http://lomigakorak.getenjoyment.net/sumuwiwaxim.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389801/normal_602e9874ac98a.pdfIn PDF document text
    • http://mavogevuz.getenjoyment.net/que_es_autoestima_baja.pdfIn PDF document text
    • http://digosige.mywebcommunity.org/77385261624.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428035/normal_602612f018fe0.pdfIn PDF document text
    • https://wamibujobaju.weebly.com/uploads/1/3/4/7/134716207/701fd3995.pdfIn PDF document text
    • https://nanawoxemataxu.weebly.com/uploads/1/3/5/3/135332584/7517204.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/189d48d9-7d44-4059-bf35-e72322f4ac3e/namubejumefosukiferejo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4ad72fe-cc86-446d-9296-e3ea077ad9c3/black_and_decker_brew_n_go_coffee_maker_reviews.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a84dc302-8e5f-4b3b-8d0f-4fe76c7b1c21/american_red_cross_blood_drive.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87d9d41a-ea00-4ece-b233-895bf3acef6e/mtd_lawn_tractor_front_wheel_bushings.pdfIn PDF document text
    • http://kepinud.rf.gd/duxola.pdfIn PDF document text
    • http://babevuzax.epizy.com/7_level_cascaded_multilevel_inverter.pdfIn PDF document text
    • http://vobewegogiz.rf.gd/cowan_lake_ohio_fishing_report.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93491305-2ab7-47c9-9897-4873a18a1ce2/73640101048.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_off0000e863.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE863 5664 bytes
SHA-256: 8b6b66987fb3020c8de60a5b0ea866f529f5b6762a322ff0c3e34890b4dde1cc
font_01_sfnt_off0000fbb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB6 11224 bytes
SHA-256: b1f2e4f6b59a525370db5f76625352358ddf82c142396b1d831639ff271a3b34