Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf9c031d44f0445a…

MALICIOUS

PDF

77.8 KB Created: 2021-03-01 12:29:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: aed3c76bb7bb0a35b221bdafc162ff67 SHA-1: da62fe6762b486b2915e18426519b9a2c54e14a4 SHA-256: cf9c031d44f0445a9d1c6f96e1c10d447d3515f7421af075e0f9c8ee66cdf39b
184 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including critical alerts for malicious redirector links and ML classification. It contains numerous embedded URLs, many pointing to disposable or suspicious domains, suggesting a phishing or malware distribution attempt. The presence of these links indicates an effort to lure users to external malicious sites, likely as part of a broader attack chain.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/wix?keyword=krav+maga+training+guide+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4417140/normal_5fe884163ee77.pdfIn PDF document text
    • http://igafnd.org/fejidedodezatefelemudobuim0au.pdfIn PDF document text
    • http://thiswaytovogue.com/videnojufitudij461c3.pdfIn PDF document text
    • https://rolobidixogiru.weebly.com/uploads/1/3/1/6/131637372/3718937.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380536/normal_5fd7501b1db8b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368767/normal_5fe7ce061c9ce.pdfIn PDF document text
    • http://cardio-natural.info/jawbone_big_jambox_repairgxxur.pdfIn PDF document text
    • http://goldenframecollision.com/the_story_of_the_human_bodyi9wl5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371013/normal_6005df3112e9d.pdfIn PDF document text
    • http://italia-doc.fun/english_grammar_tenses_in_gujaratiu9ic9.pdfIn PDF document text
    • https://gigemapafinul.weebly.com/uploads/1/3/1/3/131398374/rajujoj_tigatuno.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489713/normal_5ff93d5d29daf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443624/normal_5fffe0180f0d0.pdfIn PDF document text
    • https://gukujevanedin.weebly.com/uploads/1/3/5/3/135344472/vuzipaxoz.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
    • http://wafugid.epizy.com/13137675971.pdfIn PDF document text
    • http://vonizevugopu.rf.gd/19228464562.pdfIn PDF document text
    • http://wipovevoliku.epizy.com/acoustic_guitar_beginners_guide.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F7 4952 bytes
SHA-256: aafd46e9be774748f37daa8ca867b1b072dc97f307d48a5ce60a8d1c0d5b55cb
font_01_sfnt_off0000f8bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8BC 10276 bytes
SHA-256: 472dc479d05b98142dcfacacc4c0e8798d16f3814fb231e44ed279abae8efeb2
font_02_sfnt_off00011bd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BD9 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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