Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7f82a52e10dffa1…

MALICIOUS

PDF

62.1 KB Created: 2021-01-12 18:26:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 5a7167f4e8364f7ca1fbacf802f67f63 SHA-1: 927a0ffd692319f40f060e8b78bea481d9086c98 SHA-256: f7f82a52e10dffa1f14dc2e38b64bee86fcf318fca1439ee6e10bf0689af1066
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics, including a critical alert for linking to known malicious redirector infrastructure. The document body, though heavily obfuscated, suggests a lure related to an 'answer key'. The presence of a PDF link farm, with numerous external links, indicates an attempt to obscure the true malicious destination, which is likely the URL 'https://gettraff.ru/123?utm_term=plate+tectonics+test+answer+key'. The file also contains embedded URLs and is flagged by ClamAV as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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/123?utm_term=plate+tectonics+test+answer+key In PDF document text
    • https://dosodufixelo.weebly.com/uploads/1/3/2/6/132682620/zotulisikimorufanaze.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423715/normal_5fe61b9286dc0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420237/normal_5f967105c92d7.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/jofunoje/c_template_template_parameter_pack.pdfIn PDF document text
    • https://s3.amazonaws.com/joterige/scrabble_word_finder_game.pdfIn PDF document text
    • https://s3.amazonaws.com/pazifetanegapu/use_of_articles_rules.pdfIn PDF document text
    • https://s3.amazonaws.com/befevifa/mekuvininuvoferoz.pdfIn PDF document text
    • https://s3.amazonaws.com/tawosutosuxi/coordinating_and_subordinating_conjunctions_worksheet_8th_grade.pdfIn PDF document text
    • https://s3.amazonaws.com/bibejovixapis/awake_2019_subtitles.pdfIn PDF document text
    • https://s3.amazonaws.com/xupovobejanam/16724582215.pdfIn PDF document text
    • https://s3.amazonaws.com/jadere/cromatografia_de_adsoro.pdfIn PDF document text
    • https://s3.amazonaws.com/sefukirexuwekij/povigotexubebugiximerovux.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_off0000b8e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8E0 5052 bytes
SHA-256: 7eb5a62290b43cabdfccf92d7c6ff390323b2454e602b72812e7b53fa3e0ede5
font_01_sfnt_off0000ca36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA36 9892 bytes
SHA-256: 4592bcb83558d9041dcc4728868b59a7625698d6cfc706c66d4f3589750b88d5

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