Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b1dc6f300052758…

MALICIOUS

PDF

109.3 KB Created: 2021-01-20 09:51:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 3eae01adfd0dcd4a46f7aa2887be2e4e SHA-1: 236edf127bd6c02cbb18cecb55522cfd5d6e8a30 SHA-256: 1b1dc6f300052758a6f1a7dd5946a1db24d16ee16ce618394e807ef1166f99b2
184 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, indicating an attempt to lead the user to a malicious site. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further suggests this document is part of a link farm hosted on disposable infrastructure, reinforcing the malicious intent. While no scripts were extracted, the presence of malicious links and the ML classification strongly suggest a phishing or malware distribution campaign.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/123?utm_term=2010+secondary+solutions+romeo+and+juliet+literature+guide+answers+act+5 In PDF document text
    • https://cdn.sqhk.co/fijumirana/jdKhjcE/slot_car_track_braid_uk.pdfIn PDF document text
    • https://velumosatowe.weebly.com/uploads/1/3/4/8/134883763/vivulilexugoja.pdfIn PDF document text
    • https://cdn.sqhk.co/wuxofepure/jdhdmhd/bullet_force_game_download_for_pc.pdfIn PDF document text
    • https://xutativapejan.weebly.com/uploads/1/3/4/5/134521393/6040949.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489839/normal_5fa939b4884d7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427274/normal_5fb561373af3b.pdfIn PDF document text
    • https://zabaparadasikid.weebly.com/uploads/1/3/4/3/134317604/5660704.pdfIn PDF document text
    • https://cdn.sqhk.co/musutalivun/5DhehjH/microsoft_certified_azure_fundamentals_exam_questions.pdfIn PDF document text
    • https://kobuzefejara.weebly.com/uploads/1/3/1/4/131437799/famazuriba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474445/normal_5faabbb22f3a3.pdfIn PDF document text
    • https://site-1217552.mozfiles.com/files/1217552/xexolojudo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426415/normal_5ff05f2fdafd9.pdfIn PDF document text
    • https://site-1174819.mozfiles.com/files/1174819/kogenaduwedufemefelo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zaxefemebidaz/ganogetufogutiz.pdfIn PDF document text
    • https://s3.amazonaws.com/vososasoxumete/zasapofupebodovip.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_off00016be0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16BE0 5884 bytes
SHA-256: dfae6e604e7105ed97aa51cbc7eb53b002cd61cd7bc34608d91a6ac78db0814b
font_01_sfnt_off00017ff7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17FF7 11700 bytes
SHA-256: c88ebf7ef16c9a3e9d9c2837db09e4306e351372a89c68ca5461e294c9f8debf

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