Malicious PDF — malware analysis report

Static analysis result for SHA-256 41d51e3ba08e8942…

MALICIOUS

PDF

74.2 KB Created: 2021-02-22 22:50:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 80c029c5095a8023630004e4e97763a3 SHA-1: 6d8ea000b1b95bdc6bbfb455e957f4bf5fb7974b SHA-256: 41d51e3ba08e894262d2e4e150efaf334c091c73473afaa2bbf3823be51a1ad8
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 direct users to harmful content. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution scheme.

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://yafferge.ru/strik?utm_term=what+is+a+female+warrior+called In PDF document text
    • https://static.s123-cdn-static.com/uploads/4404966/normal_5feb4fc78b770.pdfIn PDF document text
    • http://jofarofuwudeveb.66ghz.com/wafirivujexosoguv.pdfIn PDF document text
    • http://ponojunuzed.iblogger.org/heat_proof_sheet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418970/normal_60325e37237e1.pdfIn PDF document text
    • https://cdn.sqhk.co/pixazizaze/ccTiaa6/17258852414.pdfIn PDF document text
    • https://cdn.sqhk.co/naziwixolagu/chgji8l/swing_sets_for_sale_near_me.pdfIn PDF document text
    • https://cdn.sqhk.co/pezolaje/GUhigfW/fidelenavowivobuledowane.pdfIn PDF document text
    • https://cdn.sqhk.co/viwiratoposu/qhcPigo/wurosudimofefi.pdfIn PDF document text
    • https://cdn.sqhk.co/radojiga/eja04ii/69660498943.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471235/normal_602d0169a46e2.pdfIn PDF document text
    • https://cdn.sqhk.co/wepurodapike/9dhhheq/79237216273.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/xenavuxa/bonugulowisatova.pdfIn PDF document text
    • https://s3.amazonaws.com/buwosevax/demi_lovato_heart_attack_piano_sheet_music.pdfIn PDF document text
    • http://menoziduwuju.epizy.com/kujuginu.pdfIn PDF document text
    • http://manuzuwefegovev.epizy.com/xodegalusiwelinufu.pdfIn PDF document text
    • https://s3.amazonaws.com/savifin/time_connectives_instructions_worksheet_ks2.pdfIn PDF document text
    • http://saxuwomepeboke.epizy.com/closers_survival_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/pilazi/3834920570.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_off0000e532.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE532 5368 bytes
SHA-256: d5bd3b3da636872d3cb5db28d434cf6504b2c9e5e90bf97d6abd503990cdc20d
font_01_sfnt_off0000f75f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF75F 10764 bytes
SHA-256: 205b849280888cdac9065537f997cc50ac412863b0a8a8cc3222eda2ca9a810e

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