Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ae1d4656ce1ddac…

MALICIOUS

PDF

72.6 KB Created: 2021-02-13 01:40:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 062bc1eb09c0ec1fd2311777ec5c48b1 SHA-1: ec623810df730e83e8be3f219dc6349581a9b743 SHA-256: 0ae1d4656ce1ddac1a785168dbcae22f083979b9d03adeb7be3f2ffd72d12db7
206 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. The document contains a large number of external links, many hosted on disposable domains, suggesting a link farm or redirection scheme. The presence of 'utm_term=certificate+of+good+conduct+california' in one URL indicates a lure to trick users into clicking malicious links.

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://jottigo.ru/123?utm_term=certificate+of+good+conduct+california PDF link annotation
    • http://liolika-rsya.ru/68745494275qtjs.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454056/normal_5fee3a5ec12a7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387711/normal_5ff15c713124a.pdfIn PDF document text
    • https://sonujeti.weebly.com/uploads/1/3/0/9/130969686/diduzozigewugokidivi.pdfIn PDF document text
    • http://portkamesto.site/bradbury_group_rollforming143gn.pdfIn PDF document text
    • https://cdn.sqhk.co/dajebala/Uifyhbe/infinity_sign_meaning_in_urdu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464078/normal_60141a7915250.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477167/normal_60246a10265d7.pdfIn PDF document text
    • http://2022god.com/ejercicios_de_mcm_y_mcd_1o_esofnmgw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459469/normal_5fd63f551a844.pdfIn PDF document text
    • https://wevuviwujito.weebly.com/uploads/1/3/1/6/131636984/leduluvup.pdfIn PDF document text
    • https://cdn.sqhk.co/muzorefu/xEgfWMs/cake_maker_shop_cooking_game.pdfIn PDF document text
    • https://cdn.sqhk.co/karelevo/uggigFy/84828500502.pdfIn PDF document text
    • https://cdn.sqhk.co/tazuxalana/eGgjChg/microsoft_office_day_planner_template.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_off0000ded2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDED2 4916 bytes
SHA-256: 2891330c995135a5efce01abfed7b9d3b65e5f577d501a44b4f1cbdee51a9ce0
font_01_sfnt_off0000ef98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF98 11168 bytes
SHA-256: cb5ac8922c97b078eaf680c04ac25400abbb403e19d20ecccedcdfc1c38a5335

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