Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b289bcb06879dcd…

MALICIOUS

PDF

74.1 KB Created: 2021-03-12 09:31:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: e42b24fcf3b2eea7dfd7249616edcad5 SHA-1: b588b3b17fccc3afd9d806c37425af73f47125e7 SHA-256: 9b289bcb06879dcdf2ba710aebd5f327867476176fbe7100f273bac533743ffe
184 Risk Score

Malware Insights

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

The sample is a PDF file flagged as malicious by ClamAV and an ML classifier. It contains a critical heuristic indicating it's a redirector link to a known malicious URL. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to lure the user to a malicious site, likely for phishing or to download a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://yafferge.ru/award?keyword=pdf+test+file+size In PDF document text
    • https://cdn.sqhk.co/womibakok/frWFhcC/fire_and_water_4_poki.pdfIn PDF document text
    • https://cdn.sqhk.co/jigavozef/mjfjcjd/nugit.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466689/normal_5ffd3891da391.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451019/normal_5fcdeee956f2f.pdfIn PDF document text
    • https://cdn.sqhk.co/jufulezamuko/2gijhgf/juzesazupi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409393/normal_602f86794789a.pdfIn PDF document text
    • https://cdn.sqhk.co/pidodalatip/h1GNiel/luvuxovutexuzebuz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419423/normal_602b54d5ef898.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467560/normal_6027df49eb3bb.pdfIn PDF document text
    • https://cdn.sqhk.co/jovowosifo/bp7igvu/40002175090.pdfIn PDF document text
    • https://cdn.sqhk.co/vabedesi/BMehgLQ/96152012114.pdfIn PDF document text
    • https://cdn.sqhk.co/serodozire/eSgguKz/dorigoxatunema.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/vuliwisuwig/american_beauty_music_sheet.pdfIn PDF document text
    • https://148d48ef-a78d-4e34-a4d2-755cfbac042a.filesusr.com/ugd/ccca9b_58577bea9fc74b00bc982ff3a2db9c47.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sedowedi/bandook_chalegi_video_hdvd_9.pdfIn PDF document text
    • https://8860adff-7f0b-4cf3-a358-cdd560dff136.filesusr.com/ugd/625844_7f5dbbb6692a44129162a7d54bec3964.pdf?index=trueIn PDF document text
    • https://945b3f91-9c76-4178-be32-f0dab3cfe2c6.filesusr.com/ugd/8d5d69_7e3c5e1440c34cdda9f7c59d6842da48.pdf?index=trueIn PDF document text
    • https://54179944-c6a3-49b3-9462-5d1939b6aff2.filesusr.com/ugd/49f5ef_17948fdfd2574088a83344f4d8254cbb.pdf?index=trueIn PDF document text
    • https://e437b920-fa79-41d5-b67c-0ca059f4e77a.filesusr.com/ugd/d97c10_45f23ce71b334d918f9c68d42b8932c7.pdf?index=trueIn PDF document text
    • https://01ff271a-2d66-4e22-ac0f-a796646d2f56.filesusr.com/ugd/8d93e9_053c4825ad4b44b9b0c24f5f48a75fb0.pdf?index=trueIn PDF document text
    • https://a5a8f6e1-24ae-425c-880d-6f4079e3c376.filesusr.com/ugd/035627_0a15c6ebbfec452f8a6b4fe0fb78ca88.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sifawekujiki/soundpeats_truengine_manual.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_off0000e821.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE821 4644 bytes
SHA-256: d60b291e5bd60742ff5aaa9fa2385db1d55c4c515a55fe05749f86e15d55fdcc
font_01_sfnt_off0000f812.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF812 10160 bytes
SHA-256: d519e6c67ee7535a1543a086e79849836f23023583c80cc2b506db62cab3a9c6