Malicious PDF — malware analysis report

Static analysis result for SHA-256 67c08c858d82bf7a…

MALICIOUS

PDF

71.7 KB Created: 2020-11-23 15:10:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: d3420b6bde63b397e832e8e97a1df54d SHA-1: c219292384bb566572fc4dda99750662afacb138 SHA-256: 67c08c858d82bf7a250fa0cf145080c975aa268dc506ab4322a6ca534cf8da34
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file is identified as malicious by multiple heuristics, including ClamAV and an ML classifier, and contains a large number of external links, characteristic of a link farm or phishing lure. One of the embedded URLs, 'https://trafftec.ru/strik?utm_term=exercicios+mmc+e+mdc+6+ano+doc', is flagged as unknown reputation, suggesting a potential malicious destination. The PDF structure and the presence of embedded URLs indicate an attempt to redirect users to external, potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • 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://trafftec.ru/strik?utm_term=exercicios+mmc+e+mdc+6+ano+doc PDF link annotation
    • https://sepijoverik.weebly.com/uploads/1/3/4/3/134317252/8133618.pdfIn PDF document text
    • https://novebeze.weebly.com/uploads/1/3/3/9/133997241/napunevuxuzenutiradi.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/90929b3b-1ff5-4c7d-9ff1-7b16b30764c1/32445641940.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/76fdce0f-27f0-4518-a498-8c3128f0d4c0/72283506584.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/078e8085-4d86-439e-bf6b-549763913e26/rotilif.pdfIn PDF document text
    • https://s3.amazonaws.com/mufukep/edible_sugar_sheets_for_cakes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9736ddf5-0442-4419-85e7-da3faca6f6d2/41792042996.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a44b59f3-4361-4451-8735-cbebd00d7e15/cahier_de_vacances_francais_ce2_cm1.pdfIn PDF document text
    • https://s3.amazonaws.com/buxoparadazegu/96734417958.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f2f23dd-709b-4ac7-8469-2a897c625de2/wow_blood_death_knight_leveling_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/lekelepowo/the_accountant_full_movie_300mb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/208d21ae-ddd5-4aef-8f94-b2895fafb132/93528813759.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c4d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4D7 5232 bytes
SHA-256: 4a14587c187f7c55a8b61f6cbf6fcd72479b7ebee40d7990171ec8187cbb433d
font_01_sfnt_off0000d691.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD691 11372 bytes
SHA-256: 90a309dc1a6ab19b163224d3c1906af9316b342f4af24e23d854562d3da9e413
font_02_sfnt_off0000fd44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD44 16096 bytes
SHA-256: 292b67320f20e7e38814323bff47001ccb55b5eebb397aea8a254f3e91f57b87

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