Malicious PDF — malware analysis report

Static analysis result for SHA-256 73a6b5eaf32c1fe2…

MALICIOUS

PDF

72.6 KB Created: 2021-02-23 07:59:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: ab1a21a73d7958ef5439b5cce8413e95 SHA-1: f1d483cbaf03abd6c384b622bf6f3ed92f7ea88f SHA-256: 73a6b5eaf32c1fe242628463168cc8bb74923d23bd985550184f39d1eec683b7
206 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many of which point to disposable domains, indicating a link farm or SEO spam operation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The document body, though truncated, contains metadata suggesting it was generated by wkhtmltopdf, and the presence of numerous URLs points towards a redirection or download mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://leonvi.ru/strik?utm_term=macbeth+shakespeare+play+video PDF link annotation
    • http://nashremont.site/misinuvefugebobegirpn8ro.pdfIn PDF document text
    • https://wofofubuw.weebly.com/uploads/1/3/2/7/132710679/mevevapedadevarur.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4527345/normal_5fc7c5285d60a.pdfIn PDF document text
    • http://trysalon.xyz/3d_gamestudio_a8w4y66.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373261/normal_5fec0c222bbca.pdfIn PDF document text
    • http://silkhfig.bid/tn_school_teachers_attendance_appv0ecv.pdfIn PDF document text
    • https://cdn.sqhk.co/wekaradukuve/RhemWFw/tajikowa.pdfIn PDF document text
    • https://cdn.sqhk.co/bozadukopufu/JhcbWig/5e_versatile_fighting_style.pdfIn PDF document text
    • https://dodilepu.weebly.com/uploads/1/3/4/4/134444379/rotobumiruk_mukoderup.pdfIn PDF document text
    • http://vvinorama.fun/find_out_gmail_password_on_android_phonevnub0.pdfIn PDF document text
    • https://cdn.sqhk.co/zewezerezi/jhhgi3z/11785245893.pdfIn PDF document text
    • https://cdn.sqhk.co/munoforifuso/2ViKDMI/putewupunegowimefemuwe.pdfIn PDF document text
    • https://wozaxopuvomu.weebly.com/uploads/1/3/0/7/130740129/86a4ec2642e9.pdfIn PDF document text
    • https://nerilumasufut.weebly.com/uploads/1/3/1/4/131437044/6055881.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408987/normal_5ff0073a7f091.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e045.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE045 5532 bytes
SHA-256: 383160cd1cfd143675730d9a15a3b98faa4847fc70de21c55fff7bae3508a861
font_01_sfnt_off0000f31c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF31C 10096 bytes
SHA-256: ffba5b941949a5cd6714a3f6d639d0791820d6649c450075b4c9f435b92d61ff

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