Malicious PDF — malware analysis report

Static analysis result for SHA-256 0aafc467ea019eca…

MALICIOUS

PDF

77.6 KB Created: 2021-02-16 23:40:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: fa127a5bf0f7694d094873e70479ec46 SHA-1: 2c2158cec8e1e9f66908bda558530eb4b2fb6a5c SHA-256: 0aafc467ea019eca20d5018c7265fd9bf79b59e5a725f43d33edc6cb6d5ed36f
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection, indicating malicious intent. The presence of numerous external URIs, many pointing to disposable hosting, suggests a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains metadata related to 'wkhtmltopdf' and a URL that aligns with the detected malicious activity.

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
  • 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://maypoin.ru/strik?utm_term=turning+process+in+lathe PDF link annotation
    • http://wide-do.top/xigajijolazqv6yz.pdfIn PDF document text
    • https://cdn.sqhk.co/jesovolavig/2Fhhljj/mcdonald_s_nyc_promotions.pdfIn PDF document text
    • http://efarbok.xyz/62309493934schmp.pdfIn PDF document text
    • http://kurs1.xyz/kevlar_hockey_socks_reviewpjwac.pdfIn PDF document text
    • https://cdn.sqhk.co/birenejar/eichjgg/bimamilalen.pdfIn PDF document text
    • https://cdn.sqhk.co/dudugetogi/jijjdjh/xorobuzagisazavonidiruzi.pdfIn PDF document text
    • http://riniwovefaraw.22web.org/free_spreadsheet_app_for_ipad_mini.pdfIn PDF document text
    • http://buviturowugigew.66ghz.com/2313142762.pdfIn PDF document text
    • https://molireju.weebly.com/uploads/1/3/4/6/134630509/vovevi-pirufanu.pdfIn PDF document text
    • http://5gusevshop.space/fit_father_30x3rt67.pdfIn PDF document text
    • https://cdn.sqhk.co/pifonode/djjhbib/tuwinisizor.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gikisomu.epizy.com/67874262628.pdfIn PDF document text
    • http://fudedeki.rf.gd/google_chrome_store_video_er.pdfIn PDF document text
    • http://nagivozuzosawax.rf.gd/cvc_worksheets_measured_mom.pdfIn PDF document text
    • http://vomogowejupilu.rf.gd/catholic_mass_parts_sheet_music.pdfIn PDF document text
    • http://natikajurijufuk.rf.gd/nipig.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_off0000f419.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF419 5144 bytes
SHA-256: 00d2b6ae0a6bef62314718efab8ad87f96a1e160d873deab90b3bac2a95a5167
font_01_sfnt_off00010599.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10599 10500 bytes
SHA-256: 83f3f61ff46869d5b305769b86cbf9a482e09278beb1c24389467872fe569b8b

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