Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f53046dd3eabde5…

MALICIOUS

PDF

64.0 KB Created: 2020-12-16 19:58:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 765945e34f03b014634ed47a5d9e7b26 SHA-1: 7663491ea88677ebdc0d3047048a2c95fc811d7a SHA-256: 5f53046dd3eabde5d02a9ae257242b31b0def0334033be27734820eeb7894097
156 Risk Score

Malware Insights

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

The PDF file is identified as malicious by multiple heuristics, including ClamAV and an ML classifier, and contains a large number of external links, suggesting a link farm for SEO manipulation or phishing. The presence of a URL pointing to 'trafffi.ru' with a game-related search term indicates a lure to potentially malicious content. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/strik?utm_term=pokemon+black+2+prima+guide+pdf+download
    • https://luwinititik.weebly.com/uploads/1/3/4/5/134587042/fonujodumiso.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/fca1fcbc-b5ea-4e0c-a2b7-bfadb183de7e/easy_piano_classics.pdf
    • https://s3.amazonaws.com/fujadabez/bofimibemerasexideji.pdf
    • https://static1.squarespace.com/static/5fce37932ebf7d3ac6444665/t/5fcfe29bdab39e12420d4392/1607459483552/lemon_crinkle_cookies_food_network.pdf
    • https://uploads.strikinglycdn.com/files/8344f254-f4b8-4674-8a92-ec8ba711ff6c/westwood_community_church_staff.pdf
    • https://static1.squarespace.com/static/5fc5d46edf132613bbdf5b61/t/5fc6629a5147b148040d5729/1606836890826/hack_game_animal_restaurant_ios.pdf
    • https://uploads.strikinglycdn.com/files/ae20fd6e-3719-4468-a2c0-281c2125f5b2/ribazezema.pdf
    • https://static1.squarespace.com/static/5fc53ca02e34347c7060c180/t/5fc9add9acaba317345b8c11/1607052761707/besunimupevidulenizuzun.pdf
    • https://uploads.strikinglycdn.com/files/4362a7d1-2423-49a5-98c9-a2ffc7ea70d8/23474627636.pdf
    • https://s3.amazonaws.com/gebaxovudofe/hunterborn_sse_guide.pdf
    • https://s3.amazonaws.com/takurugilij/47622589962.pdf
    • https://s3.amazonaws.com/folexapurilowe/renal_tubular_acidosis_guidelines.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf4fe89d7936484084b407/1606373354481/kero_the_wolf_twitter.pdf
    • https://s3.amazonaws.com/bisapovepizaj/sunadu.pdf
    • https://s3.amazonaws.com/sugaguxagu/janaribe.pdf
    • https://s3.amazonaws.com/podawakumepewez/mortal_kombat_x_fatalities.pdf
    • https://static1.squarespace.com/static/5fc107c868612547ed5eda4d/t/5fce1c7ceb18547f4bac45ce/1607343229377/43337445356.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ba26.bin
8ca8fbb7608a0ceb8c8a8ef4c143bdb4362eed2a083e5bcadebd486750ff4443		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBA26 5724 bytes
font_01_sfnt_off0000cda6.bin
5c8af3271b9f9c848240acec27dd17ab98eb45cbac7b7ff244ca16a07b2e596e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCDA6 11084 bytes

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