Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c5ed91ac1e81d5b…

MALICIOUS

PDF

86.1 KB Created: 2020-12-16 01:02:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 09009ed5faa991cc227eee825b835fef SHA-1: 1dfa2127bad3ed5ddae675f1343a676a525b7d3f SHA-256: 0c5ed91ac1e81d5ba6eba1cdb8d07f2aeeb32eca7240dd5a6996463dc20ce2f3
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one prominent link pointing to 'trafftec.ru'. Heuristics indicate a PDF link farm and a ML classifier flagged the PDF as malicious. ClamAV also detected it as 'Pdf.Phishing.Trojan'. The document body, though heavily obfuscated, suggests a lure related to a 'Momentum worksheet with answer key'. The presence of embedded URLs and the overall structure strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://trafftec.ru/123?utm_term=momentum+worksheet+with+answer+key
    • https://jalaxogazumin.weebly.com/uploads/1/3/4/3/134373329/8afcd79.pdf
    • https://cdn-cms.f-static.net/uploads/4388824/normal_5fa201fe60cee.pdf
    • https://cdn-cms.f-static.net/uploads/4369777/normal_5f89099b5069c.pdf
    • https://cdn-cms.f-static.net/uploads/4367905/normal_5f9045d47229c.pdf
    • https://visenapanelowoj.weebly.com/uploads/1/3/4/5/134581819/venezata_buvivaviguxe_lanokujiresabev.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/jevopemosod/12484367037.pdf
    • https://static1.squarespace.com/static/5fc6d632c39fde0238a5f002/t/5fcdcd8505ddc9599d42f673/1607323013520/13572424852.pdf
    • https://static1.squarespace.com/static/5fce2a8a996d611d5f629464/t/5fd1e62eebc7ce75e8b4c728/1607591470848/stack_fall_3d_unblocked.pdf
    • https://static1.squarespace.com/static/5fc0d92f11f6a4198485658d/t/5fc253e9fa04221c716b5182/1606570986318/rational_inequalities_worksheet_with_answers.pdf
    • https://static1.squarespace.com/static/5fc15fe03dfdd95b60d86875/t/5fcdb27833187724c40f9a81/1607316110802/87083302079.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe4397173fb5383b6e9922/1606304668284/90605880502.pdf
    • https://static1.squarespace.com/static/5fc5510aa13a450bab11af48/t/5fc6982d645712565422e5ee/1606850605747/cross_stitch_xmas_stocking_kits.pdf
    • https://s3.amazonaws.com/suxugipipolazog/chris_powell_diet_plan.pdf
    • https://uploads.strikinglycdn.com/files/2d01b697-ae91-49ab-b846-59be3cccb677/east_clinton_local_schools_staff_resources.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc6d.bin
85b692c1c636aed9ab1240d2a7361179fdd6c0849396a06064984f922e967b4f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC6D 2828 bytes
font_01_sfnt_off00010667.bin
2f41ea4b99e565db010e1451c6b39c0779b3cbf660d7726c02a01aa32dd565a6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10667 5036 bytes
font_02_sfnt_off0001176d.bin
8fa1b8dc82f500be5298fac413dcabe79283fee6f2a0cc5edb6b323ddc575823		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1176D 10488 bytes
font_03_sfnt_off00013aeb.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13AEB 4324 bytes

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