Malicious PDF — malware analysis report

Static analysis result for SHA-256 709c3f31391a7988…

MALICIOUS

PDF

62.0 KB Created: 2020-12-20 20:09:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: c87167653a1ba3e3e906988152217159 SHA-1: 2818f9f2e27b647ffac37f7364cc710c1d5e3b72 SHA-256: 709c3f31391a7988ce2fe506fd6c19c45c2bba8b34e885895bc47de7fa3704e9
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics and an ML classifier, indicating a phishing and redirection attempt. It contains a link farm with numerous external PDF links, including one pointing to a known malicious redirector. The ClamAV detection further supports its malicious nature, classifying it as Pdf.Phishing.Trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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.
  • 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.
  • 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/strik?utm_term=pulsar+npwa01+watch In PDF document text
    • https://pumutetigowon.weebly.com/uploads/1/3/4/6/134699291/xijaxumir-benifoku.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488130/normal_5faf3c2812b38.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420239/normal_5fd2ef2f1aeaf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4530323/normal_5fb84648b53fa.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/rijaliwiguvex/inquizitive_answer_key_psychology_chapter_1.pdfIn PDF document text
    • https://s3.amazonaws.com/wefemabeni/tetipoputi.pdfIn PDF document text
    • https://s3.amazonaws.com/mejifavo/47408383899.pdfIn PDF document text
    • https://s3.amazonaws.com/baritexovopa/who_blocked_me_on_facebook_app.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3dacab36-714b-4201-afe0-c95d8e0aa3eb/biografia_de_los_hermanos_flores_magon.pdfIn PDF document text
    • https://s3.amazonaws.com/gizonukorad/stripe_tailed_scorpion_vs_tiger_centipede.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b39b5b1d-5b9b-45e9-b656-b0422c57b911/damalujamemepoxonedomal.pdfIn PDF document text
    • https://s3.amazonaws.com/vixuwogetiv/bumblebee_transformer_cardboard.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_off0000b4a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4A4 5308 bytes
SHA-256: 94746536eafb79926cdc8a44cbf3e7e15a8f0eed1ce65ec139c0fb5eba8e84e3
font_01_sfnt_off0000c6c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6C1 11076 bytes
SHA-256: 0d0e66f99eeaefced3594469fedc644b2215680bf7b93cb2a029e747495d09a4

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