Malicious PDF — malware analysis report

Static analysis result for SHA-256 640587b7aefbacd3…

MALICIOUS

PDF

272.4 KB Created: 2020-11-14 21:15:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 62150a2dae7c847a1e4f62fe88e860d1 SHA-1: 1f1cee3645d42f65a26af1b1e16166b31da7738d SHA-256: 640587b7aefbacd3879eb5cc885eb5e2c131cffec41bea0ddddd2601f53e09a9
174 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by multiple heuristics, including a critical alert for linking to known malicious redirector infrastructure. The 'SE_CALLBACK_LURE' heuristic indicates it's designed as a callback phishing attempt, likely impersonating official communications to trick users into calling a fraudulent number. While no scripts were extracted, the embedded URL is a primary indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 5

  • 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.
  • 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/123?utm_term=marvel+future+fight+shadowlands+guide In PDF document text
    • https://wetifojijebene.weebly.com/uploads/1/3/4/4/134474841/1089719.pdfIn PDF document text
    • https://kokexofagisukop.weebly.com/uploads/1/3/2/7/132710589/tuwovure.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384817/normal_5f9200cb9efcc.pdfIn PDF document text
    • https://rikurifijuse.weebly.com/uploads/1/3/4/6/134681474/riletovega.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393345/normal_5f97cea187476.pdfIn PDF document text
    • https://xegiwisupanax.weebly.com/uploads/1/3/4/3/134367095/9d235781.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456166/normal_5fa56189c2147.pdfIn PDF document text
    • https://saxexowiki.weebly.com/uploads/1/3/0/9/130969873/5930925.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3de1cf5-ba6c-416d-b75b-11ebe863e19d/harry_potter_books_word_count.pdfIn PDF document text
    • https://s3.amazonaws.com/gawabog/maraved.pdfIn PDF document text
    • https://s3.amazonaws.com/xukonakefules/how_to_install_apk_on_windows_phone_10.pdfIn PDF document text
    • https://s3.amazonaws.com/nepawigexa/dejijil.pdfIn PDF document text
    • https://s3.amazonaws.com/tubupejevomo/69808488630.pdfIn PDF document text
    • https://s3.amazonaws.com/nefomojuwet/list_of_regular_verbs_in_english.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_off0003f4e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3F4E3 5328 bytes
SHA-256: 4e8c48c7197b12a91d22b3d64d697f5582058cbfbbee7aad15e5fd74a36a0c8b
font_01_sfnt_off0004071d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4071D 12760 bytes
SHA-256: a5d55c265d8f400b2ce87175b9356d5400a423f36181ef7476e783cf26a0e203

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