Malicious PDF — malware analysis report

Static analysis result for SHA-256 499bc3de7aa3d84d…

MALICIOUS

PDF

94.3 KB Created: 2021-03-17 20:47:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bb41a748a8301155243de823a8853129 SHA-1: 164cd155143a8c13c945e7307d09a2fca9f1d689 SHA-256: 499bc3de7aa3d84d0ac080c7bc650e42ee2dec5c6022c6cdcd2111828241f39e
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for phishing or distributing further malware. ClamAV and ML classifiers strongly indicate maliciousness, specifically flagging it as a phishing trojan. The embedded content, though heavily obfuscated, likely facilitates the redirection to malicious URLs.

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-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://jumiwimov.ru/award?keyword=cfop+pdf+2020
    • https://netexebi.weebly.com/uploads/1/3/0/8/130815192/2221464.pdf
    • http://poroda.site/tevisojojarnogpc.pdf
    • http://shoop-fm.ru/myanmar_rohingya_un_reportle67d.pdf
    • http://mybiol.site/790835765llh6o.pdf
    • https://bixolajulepu.weebly.com/uploads/1/3/4/7/134746591/6077785.pdf
    • https://sejumajofejopib.weebly.com/uploads/1/3/2/7/132740214/jenoler_sojupuwivefini_litelitewoxeda_segoj.pdf
    • http://organicnu.info/921694356600eof9.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://8c17aa34-c454-4d6c-a218-8929c845e329.filesusr.com/ugd/808cd0_e24962c34a014a41899088acc0e102f5.pdf?index=true
    • https://f8e303d0-f350-43d2-b7c3-f886ef13ec25.filesusr.com/ugd/1bb397_baa4b87c9ebc4ec587ecb56431c1e654.pdf?index=true
    • https://s3.amazonaws.com/pujirageg/bidurubezigini.pdf
    • https://9de673a2-3b8e-40eb-bbf5-c0ad8e71a3da.filesusr.com/ugd/bd5c68_802c60652b0f4c0685c405e45fa5adb8.pdf?index=true
    • https://s3.amazonaws.com/tufujifinobiro/xesuwexinufizekofubi.pdf
    • https://s3.amazonaws.com/rotowan/taekwondo_red_belt_form.pdf
    • https://s3.amazonaws.com/zeworibuzoza/les_contes_interdits_blanche_neige_gratuit.pdf
    • https://s3.amazonaws.com/zevutebulaworel/into_the_wild_jon_krakauer_chapter_summary.pdf
    • https://3745348a-78a0-42d7-8ff4-af2b45bf5faf.filesusr.com/ugd/02631b_9a6b1ac6cfc34b38bdc8816b749d00ef.pdf?index=true
    • https://5c2cca0d-3a4e-48b0-93bf-8ac6c0c026cb.filesusr.com/ugd/271e65_cb5fce3155cc422f993ebc6a9c72a68f.pdf?index=true
    • https://61069a5e-3c5f-4884-a3c7-8c7552058b74.filesusr.com/ugd/0789d5_d639c02ffe034966a3765c38cb7727e7.pdf?index=true
    • https://7f03322d-63d6-449b-a8c2-a80beffeb2b6.filesusr.com/ugd/2994dd_f034c27618c64171b9935735bdb2e7c7.pdf?index=true
    • 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_off00011c1e.bin
0588668826aa25d6a9322b8548db69a30810ed651ed1811a9fc3c1c09ccf6b3b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11C1E 4252 bytes
font_01_sfnt_off00012a90.bin
8b88185fb1caa19b127db774f1e773b8ec41d1394bc7b72cd727186061f48d9d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12A90 2248 bytes
font_02_sfnt_off000134e3.bin
950e7ca82e1a94ee0953cce3e53ce522b97769c2e9a5aba14ad1ea017a486e12		 pdf-font-stream PDF embedded font (sfnt) at offset 0x134E3 13028 bytes
font_03_sfnt_off00015c6e.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15C6E 4324 bytes

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