Malicious PDF — malware analysis report

Static analysis result for SHA-256 17281c77b14e4fe0…

MALICIOUS

PDF

71.9 KB Created: 2020-11-12 17:14:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 00ccfe7a3d2edee4572fec5b0ce90754 SHA-1: 3d9128232d7078f7d8254e4b605366ea9f0f72b4 SHA-256: 17281c77b14e4fe08ccf0e762e3e0c6c61340c09601b9cb3ac70cec19ba69f9b
234 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics, including a critical alert for linking to known malicious redirector infrastructure. The document contains a mass external PDF link farm, suggesting an attempt to drive traffic to various sites, one of which is a known malicious redirector. The presence of a callback lure heuristic further indicates a phishing or scam attempt.

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 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.
  • 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://cctraff.ru/strik?utm_term=the+bedford+researcher+6th+edition+online In PDF document text
    • https://cdn-cms.f-static.net/uploads/4408991/normal_5f9b4727dc644.pdfIn PDF document text
    • https://sulewana.weebly.com/uploads/1/3/4/6/134605909/4e4234b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366376/normal_5f8b021c94edb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/petuzutemixuvod/cours_grammaire_anglais_toeic.pdfIn PDF document text
    • https://s3.amazonaws.com/tipikaxe/42339260893.pdfIn PDF document text
    • https://s3.amazonaws.com/nolomuxuma/latex_girdle_body_shaper.pdfIn PDF document text
    • https://s3.amazonaws.com/rizezobabub/wodineperewafepuwapi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8573925a-9f59-4513-8abb-8e4628eaa3cd/plumbs_veterinary_drugs.pdfIn PDF document text
    • https://s3.amazonaws.com/gupuso/40735803522.pdfIn PDF document text
    • https://s3.amazonaws.com/penefelomiju/super_duper_game_cartoon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/216c9255-f04e-4245-9957-aa37a4cf0f10/vugoxujaf.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d07e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD07E 5140 bytes
SHA-256: 777872f5433377bc2625aa63c5f089eae7a3758cdb44ca60b17a431655f172ae
font_01_sfnt_off0000e1eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1EB 10048 bytes
SHA-256: 381ed2359c1569e88b6d81b21dda524e0e3aa48b7833b00f29a826437fb6fec4
font_02_sfnt_off00010472.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10472 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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