Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dfd0c65e7fd11a9…

MALICIOUS

PDF

84.8 KB Created: 2021-02-15 10:22:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 04bb2fd4b34beaa9292636f5ec098f33 SHA-1: cfa00f2d533c8254955a82649f9ad672dce69be8 SHA-256: 9dfd0c65e7fd11a9f28e94298d8320e12fb550ede99ca587112a66e8e0cad6e8
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or delivering a secondary payload. The document's content, though partially obfuscated, hints at a lure related to 'free computer lessons for seniors and beginners'. No scripts were extracted, but the PDF structure itself is being leveraged for malicious redirection.

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
  • 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://seumenha.ru/strik?utm_term=free+computer+lessons+for+seniors+and+beginners PDF link annotation
    • http://asia.kiwi/oxford_discover_foundationtveyu.pdfIn PDF document text
    • http://psylath.com/fufizitevetiwadujoxawoj4p4bk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409095/normal_5fcf451675d31.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381085/normal_60285d30c3ea8.pdfIn PDF document text
    • http://confirmyourverifiedbadge.com/samsung_family_hub_counter_depth_refrigerator_reviews9pt06.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470692/normal_5ffe43a73906f.pdfIn PDF document text
    • http://tozufokoxogo.22web.org/sensorineural_hearing_loss_guidelines.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371248/normal_5fec18550dcee.pdfIn PDF document text
    • http://missunik.space/70257179076i9h4c.pdfIn PDF document text
    • http://opros.xyz/gigefugafesipibedabcuor0.pdfIn PDF document text
    • http://lenudes.com/90876330179ejhkn.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417834/normal_601d9f01de900.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425217/normal_60287b075eef4.pdfIn PDF document text
    • http://wownatural.fun/664717918632l77m.pdfIn PDF document text
    • http://rrrrkkkkk.space/cell_reproduction_mitosis_and_meiosis_worksheet_answersix7a6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467038/normal_5fcfb48457146.pdfIn PDF document text
    • http://es50off.pro/megel05cbi.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
    • https://s3.amazonaws.com/xakusineba/83785234102.pdfIn PDF document text
    • https://s3.amazonaws.com/wazagidonux/46925890927.pdfIn PDF document text
    • http://pixokux.rf.gd/98268295008.pdfIn PDF document text
    • http://vomifavub.epizy.com/forget_you_d._ear_piano_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/budovewesekaz/kever.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_off00010056.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10056 5452 bytes
SHA-256: f72bd14ccb5474773e5ca4b6cc15d01ec26041e3abdfe6fa8198dee10dc33d78
font_01_sfnt_off000112be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112BE 10876 bytes
SHA-256: eccd36ac9e80f9ab7171967c6a3d2849757c777b96b18f713c28666f256c1a14
font_02_sfnt_off00013782.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13782 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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