Malicious PDF — malware analysis report

Static analysis result for SHA-256 85b7f436c5aaada1…

MALICIOUS

PDF

71.7 KB Created: 2021-03-04 00:12:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: f3544658159e719283d3e04737db85d5 SHA-1: 53a93e68838b673e8b7b01cf2c984dd470b3425c SHA-256: 85b7f436c5aaada153c17d0837dda94705ab3209392cf5ffaf29db77d267cfde
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The sample is a PDF document flagged by ClamAV as a phishing trojan. Heuristics indicate it functions as a link farm and a callback phishing lure, prompting users to call a number for support or billing issues. The embedded URLs and the document's structure suggest an attempt to redirect users to malicious sites or initiate fraudulent phone calls.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://nipisod.ru/wix?keyword=plantronics+calisto+5200+manual PDF link annotation
    • https://cdn.sqhk.co/raxoxawupej/gyhgRgj/download_qb9_s_3d_skin_editor_for_minecraft.pdfIn PDF document text
    • https://cdn.sqhk.co/gutinisiv/jcWhdjd/tawozebivus.pdfIn PDF document text
    • http://storeeu.info/gamofizuv002zo.pdfIn PDF document text
    • https://cdn.sqhk.co/vuzonabudad/qrYgfl6/rubel.pdfIn PDF document text
    • http://topplafond.xyz/pirodoxigamuleliafy.pdfIn PDF document text
    • https://cdn.sqhk.co/bikegola/heidhgi/karegavijafukago.pdfIn PDF document text
    • http://gratoramaa.website/162485794314dzhq.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496602/normal_5fd31d4f0b0d6.pdfIn PDF document text
    • http://nout-prokat.website/astrologian_rotation_guidejl6ts.pdfIn PDF document text
    • http://opensoda.pro/windows_10_startup_batch_file_not_runningqcma6.pdfIn PDF document text
    • http://nigma24invest.online/digestive_system_worksheetcthxp.pdfIn PDF document text
    • https://cdn.sqhk.co/xumupojamax/fy1qgcY/strategic_marketing_plan_example.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/setikizo/gevode.pdfIn PDF document text
    • https://s3.amazonaws.com/sulasatevirexo/hifumi_persona_5_gift_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_off0000daf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAF8 5344 bytes
SHA-256: 28abdd8fca5aa096e5d1d95887a0886dac58dae7a89cb8a4941a1eb5668a54f6
font_01_sfnt_off0000ed0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED0F 10612 bytes
SHA-256: 3e19b086cda844b9b53701ab0d53d663b4e9092f9a75f53019adc6a727be8549

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