Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7e52a8e8f3812a3…

MALICIOUS

PDF

66.0 KB Created: 2021-04-06 02:12:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 2a37c1a22caf83d7e4d9b0694c87256f SHA-1: 6b2c2cbd4915b63cc1d9fb8d3c0b2c0af7f7552f SHA-256: b7e52a8e8f3812a32987742e2ca8803b8329868d5454b43eca13bf774e8b1e92
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one pointing to 'fokemale.ru', suggesting a phishing or scam lure disguised as educational material. The presence of external URIs and the nature of the detected malware (Pdf.Phishing.Trojan) strongly suggest a phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://fokemale.ru/award?keyword=holt+chemistry+textbook+pdf+teacher+edition PDF link annotation
    • http://vifedefodukamas.22web.org/13613229286.pdfIn PDF document text
    • http://bududusawuwepi.iblogger.org/nimejopeluvowexizor.pdfIn PDF document text
    • http://saramofupoke.iblogger.org/kisuxijikowaverize.pdfIn PDF document text
    • http://zotuxizuso.iblogger.org/blender_beginner_tutorial_level_2.pdfIn PDF document text
    • https://cdn.sqhk.co/difigobon/iQWjhJf/flower_garden_banks_scuba_diving.pdfIn PDF document text
    • https://cdn.sqhk.co/runusamopit/QjhPhgd/curriculum_vitae_editable.pdfIn PDF document text
    • http://lufoveferezudu.22web.org/miduwogaxune.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/32438421-5775-4426-8e8a-ab6c106012fe/la_la_land_sad_ending_reddit.pdfIn PDF document text
    • http://zubikexef.rf.gd/derimibowopubativifekutub.pdfIn PDF document text
    • http://xenuduximowub.epizy.com/91160323630.pdfIn PDF document text
    • https://s3.amazonaws.com/tomamujuf/69201471432.pdfIn PDF document text
    • http://kiwizenodemi.epizy.com/iso_9001_why_is_it_important.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa2f715f-1857-4acc-b305-12b4ae887e7e/godawapedu.pdfIn PDF document text
    • http://bividit.rf.gd/ccie_service_provider_books_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17495c61-299c-4ce6-a276-8c5d6d06c5e3/jerunapumiregopuj.pdfIn PDF document text
    • https://s3.amazonaws.com/fidefofudi/nolapudubuzebex.pdfIn PDF document text
    • https://s3.amazonaws.com/loxopudizus/xumafuxunojijafagaposi.pdfIn PDF document text
    • https://s3.amazonaws.com/numunenoji/kuwapumapibax.pdfIn PDF document text
    • https://s3.amazonaws.com/lepefi/8843871307.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_off0000c13b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC13B 5732 bytes
SHA-256: 9cfa2dbd7f6eec0310f53545ffb4309ec13ab750c61adae79b140ad7e744e651
font_01_sfnt_off0000d492.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD492 10920 bytes
SHA-256: 8264d2479069a3810a92bbdc14debea0b5dc0c977c215c3c97d2ba64a78f183c

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