Malicious PDF — malware analysis report

Static analysis result for SHA-256 91245ba46dfac7f7…

MALICIOUS

PDF

68.2 KB Created: 2020-12-10 13:40:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 91d555e8bef5dbce9af3e7c369c1c61c SHA-1: d563bb1b3e7ce298dcdd0cd961031bf3bdd79232 SHA-256: 91245ba46dfac7f79096696fdedbfd3d48d80038f4f9839345e7e1fd3543c39f
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, with one pointing to 'traffine.ru', suggesting a link farm or phishing attempt. The document body, though heavily obfuscated, contains metadata related to 'wkhtmltopdf' and a title that appears to be a lure for users interested in engine efficiency.

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://traffine.ru/strik?utm_term=turbofan+vs+turbojet+efficiency
    • https://wavenugila.weebly.com/uploads/1/3/4/8/134852162/86ee3.pdf
    • https://cdn-cms.f-static.net/uploads/4456116/normal_5fd1e50cf3c44.pdf
    • https://cdn-cms.f-static.net/uploads/4386605/normal_5fb3ea3b5ec38.pdf
    • https://static.s123-cdn-static.com/uploads/4390999/normal_5fc7acc3e328a.pdf
    • https://static.s123-cdn-static.com/uploads/4481676/normal_5fc52101479d2.pdf
    • https://cdn-cms.f-static.net/uploads/4409606/normal_5fd1522742cf5.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/3c613ff9-e7b9-441a-92ec-e8e1127f822a/70461014863.pdf
    • https://static1.squarespace.com/static/5fc66c783dfdd95b60faf88d/t/5fcfa7e21a78ee5f01710b63/1607444451988/icon_clash_fleece_hoodie.pdf
    • https://uploads.strikinglycdn.com/files/cb152063-1dda-4b3b-ab73-8423ef4324e5/86838190943.pdf
    • https://uploads.strikinglycdn.com/files/93ef538c-356d-440d-a24f-5e1b2b1b5be4/89453049475.pdf
    • https://static1.squarespace.com/static/5fcf37488de9584222156158/t/5fd007ea3679834d723f5b7d/1607469035773/minecraft_world_map_viewer.pdf
    • https://uploads.strikinglycdn.com/files/88347e34-129d-4a5a-bd59-2c5f430dda9b/roblox_sound_ids_2019_sucker_jonas_brothers.pdf
    • https://uploads.strikinglycdn.com/files/cb947e1e-09c7-4979-9f4c-8eb054695a49/65162473883.pdf
    • https://uploads.strikinglycdn.com/files/6c352df1-1963-4401-8863-2f6b635743b9/killing_mr_griffin.pdf
    • https://static1.squarespace.com/static/5fc57607ec917750a3f6703a/t/5fcae3489cf56e0e8b0659f8/1607131976701/mars_colonization_board_game.pdf
    • https://static1.squarespace.com/static/5fc0f2f6c89e1c4b8fbea157/t/5fc2e6f6bc819f1cf438d3f0/1606608631380/skyrim_frost_horse_missing.pdf
    • https://uploads.strikinglycdn.com/files/bcd9f104-1319-4560-bec7-d2aba853eefc/jinexegumebose.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_off0000d0bf.bin
bd0bbd601390a8382b4728e3dad1467054142f22407d747e2eddd1b23787d7f8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD0BF 5168 bytes
font_01_sfnt_off0000e278.bin
1c5966a11c3c2f3db264cd959c6150e74317edc6e1a06a8876425a789892ce23		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE278 9844 bytes

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