Malicious PDF — malware analysis report

Static analysis result for SHA-256 1559acfb5ba38a1c…

MALICIOUS

PDF

70.3 KB Created: 2021-01-29 22:54:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 097794fad2f143ef0785e7d916f76908 SHA-1: a9091256baace21f02db02487192c09f7890ba48 SHA-256: 1559acfb5ba38a1c9aeb713ceee1a5dd1c661f2a6c0b8f8b47b791ecbbeb0fa0
204 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with several pointing to known malicious redirector infrastructure or disposable hosting, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to redirect users to malicious sites, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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.
  • 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://gettraff.ru/wb?keyword=ball%20drop%20nyc%20replay%202020 In PDF document text
    • https://cdn.sqhk.co/loxowopiv/gjrHFv5/dadutu.pdfIn PDF document text
    • https://cdn.sqhk.co/sizozizaj/BHhgfGd/vevajolawemimusuwijirob.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383452/normal_5fd86e84003bd.pdfIn PDF document text
    • https://cdn.sqhk.co/zurefaxenov/jbaiege/zimewogozusewulokar.pdfIn PDF document text
    • https://cdn.sqhk.co/buruvalufe/9ulOidw/london_forecast_today_hourly.pdfIn PDF document text
    • http://lefuvaguvupawax.iblogger.org/a_bug_s_life_movie_in_telugu.pdfIn PDF document text
    • http://kindraretterath.com/homophones_in_english_exercisescnquj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471082/normal_5fd6745741839.pdfIn PDF document text
    • https://cdn.sqhk.co/juxerawabuf/gd7jbja/84036372050.pdfIn PDF document text
    • http://flipping-car.online/xigoboul8b8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418185/normal_5fcb94c4ef1f4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://relimimukavewuj.rf.gd/31135220700.pdfIn PDF document text
    • http://jonemif.epizy.com/cplp_study_guide.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_off0000d5d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5D3 5312 bytes
SHA-256: 6548db76793cce56db6551f04c8e712e51a5b077dd47115ee1c70e42030f8c31
font_01_sfnt_off0000e7fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7FB 10824 bytes
SHA-256: f3fe76c5ab69ba6b96394369e922bf406e1f467a6759dec26f10b83e0315141d

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