Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8c2bc03703d2105…

MALICIOUS

PDF

65.4 KB Created: 2020-12-16 21:39:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: f779544c84f862be9933f92de0364e00 SHA-1: eb5e0ef919c6514f4d6d6a28ab7eb0931ff348c1 SHA-256: a8c2bc03703d210562e0db4109cd7f875e94c2efe1f54360eb5b082328d1d200
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains an embedded URI pointing to 'traffset.ru', which is likely used to redirect the user to a malicious site. The document body appears to be heavily obfuscated or corrupted, preventing a clear understanding of its specific lure, but the presence of external links and the malware detection strongly suggest a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://traffset.ru/123?utm_term=engagement+party+favors+diy PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4377679/normal_5fcc2e3a54b01.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411273/normal_5f9a106002b33.pdfIn PDF document text
    • https://xirunokud.weebly.com/uploads/1/3/4/4/134467368/2168155.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/legenapi/non_material_culture_sociology_definition.pdfIn PDF document text
    • https://s3.amazonaws.com/wetevali/karegu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59cc2c90-9dae-4ee4-86ab-800f1397a024/rubutujalonivedegaxadetud.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc14640df132613bbc04837/t/5fc4ea2ff81c9a2a0c3c9bd5/1606740527867/30207337150.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d6714a8-d3b0-45e4-8a67-065d6b522d4c/jar_of_hearts_piano_sheet_music_musescore.pdfIn PDF document text
    • https://s3.amazonaws.com/vopadofugon/monkey_go_happy_2_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/jifesu/gastronomia_mexicana_patrimonio_de_la_humanidad.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc114788ef7301f8b11b9bb/t/5fc1be9964571256547d77e4/1606532762363/cell_structure_crossword_puzzle_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/resisuna/snake_and_ladder_game_information.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/636a90b7-4898-4d5f-91e9-75c4f70ae0c4/theme_store_apk_realme_2.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_off0000c376.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC376 5448 bytes
SHA-256: bd15149ac6d5172e08527d9efb65675c409af3d73a816bed6b833e1b6e78fa44
font_01_sfnt_off0000d603.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD603 10604 bytes
SHA-256: 18429ab5289d374ffdb50d4eaa1a1ce69da4041555ffc49faf7a52643ae8b3fc

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