Malicious PDF — malware analysis report

Static analysis result for SHA-256 87ff5cf7de00765a…

MALICIOUS

PDF

68.7 KB Created: 2020-11-22 15:51:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: b47b1fd9c54217f20e4b9d9076df19d7 SHA-1: 3a960f90580d82e390a4109ad697b6cc828e2607 SHA-256: 87ff5cf7de00765aff0317af5fa8b29224d7575f12fbc7d91adf920f1dc3bec3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious Link

The PDF contains a significant number of external links, as indicated by the PDF_SEO_LINK_FARM heuristic. One of the primary URLs, 'https://trafffi.ru/aws?utm_term=unit+7+exponential+and+logarithmic+functions+answers', suggests a lure related to educational content, likely to attract clicks. The ClamAV detection and ML classifier strongly indicate malicious intent, consistent with phishing or SEO poisoning tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafffi.ru/aws?utm_term=unit+7+exponential+and+logarithmic+functions+answers PDF link annotation
    • https://logekififej.weebly.com/uploads/1/3/4/5/134502341/af9c5b2514.pdfIn PDF document text
    • https://zoniziwaxetoxa.weebly.com/uploads/1/3/4/4/134441104/fbb22e77050.pdfIn PDF document text
    • https://guvisine.weebly.com/uploads/1/3/4/5/134598756/95278619b42.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/henghuili-files/accounting_theory_in_hindi.pdfIn PDF document text
    • https://s3.amazonaws.com/zerepuzuze/animal_instinct_skepta.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3a73eb9-ccc3-4879-a1c5-2617ff2879f4/happy_new_year_songs_downloads.pdfIn PDF document text
    • https://s3.amazonaws.com/wiwuxot/backstab_apk_mod_mali.pdfIn PDF document text
    • https://s3.amazonaws.com/muvemasoxaji/watermark_program.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69d434b0-74d9-414e-9b95-989e6a7ffb34/marine_le_pen_oeuf.pdfIn PDF document text
    • https://s3.amazonaws.com/bokofapig/24360334250.pdfIn PDF document text
    • https://s3.amazonaws.com/kuxuxemu/19355388831.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_off0000cbd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBD2 5800 bytes
SHA-256: a7d2f73112352e9152a0974a793897c541dd4c347057a8264b10256ddfd4fe59
font_01_sfnt_off0000df8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF8F 12352 bytes
SHA-256: dc643346fb83dd76c2eb21535773e3906b4ead52f54c82b7a1ad42d9095d848d

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