Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6489f61866cefd2…

MALICIOUS

PDF

72.6 KB Created: 2020-12-09 08:28:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 55e6cf0174a5762e462f432566a2a643 SHA-1: c10c5dd8fb156e144aed513a3d8e1614f3249523 SHA-256: b6489f61866cefd205f0f288832ea0c025ced34f2fbe8c9e856e1b3b5a2fff58
156 Risk Score

Malware Insights

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

The PDF document contains numerous external links, a common tactic for SEO poisoning or phishing lures. The primary external URL, 'https://trafffi.ru/strik?utm_term=what+is+reentrant+function+in+embedded+systems', appears to be a malicious redirection or phishing site. ClamAV and ML classifiers strongly indicate maliciousness, classifying it as a phishing trojan.

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=what+is+reentrant+function+in+embedded+systems
    • https://fetofopup.weebly.com/uploads/1/3/4/5/134507679/322df39.pdf
    • https://jasazifo.weebly.com/uploads/1/3/1/4/131437377/863e6.pdf
    • https://cdn-cms.f-static.net/uploads/4475861/normal_5fae97c099223.pdf
    • https://buxomajuse.weebly.com/uploads/1/3/4/5/134588570/witemupedogufuw.pdf
    • https://static.s123-cdn-static.com/uploads/4421365/normal_5fc98c674f65a.pdf
    • https://repotadidutu.weebly.com/uploads/1/3/4/3/134310826/maviwonut.pdf
    • https://resonorur.weebly.com/uploads/1/3/4/8/134874279/tijurufazas-mupavenupa-rinepovetemi-moradamudigepup.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static1.squarespace.com/static/5fc0f1b0084698658e5e73ac/t/5fc9f4238d0ac92c7be6acc3/1607070760459/lose_belly_fat_tummy_exercise.pdf
    • https://s3.amazonaws.com/jonora/56074789993.pdf
    • https://s3.amazonaws.com/rotowan/wrong_turn_movie_300mb_free.pdf
    • https://s3.amazonaws.com/xeponodij/absence_from_work_letter_template.pdf
    • https://static1.squarespace.com/static/5fc4ef5cbe9b69395124a64b/t/5fc6b6130623334b0c466a29/1606858259677/melidasojofobitufibopu.pdf
    • https://s3.amazonaws.com/wilugugo/neluv.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf6c2e18e72e5fdbd04ce1/1606380596547/69324971180.pdf
    • https://s3.amazonaws.com/sefiwegegagu/color_by_number_games.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cfff.bin
0fc29c5789a9f1f39eeef0ed51b1e5f6a6f622fe83f8558fc6c833735a01b9d1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCFFF 5364 bytes
font_01_sfnt_off0000e218.bin
7ec8c63cc4c47df8233ec32321fd1b547b9afd322a26de787acafe8b13b43d28		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE218 10708 bytes
font_02_sfnt_off000106d9.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x106D9 4324 bytes

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