Malicious PDF — malware analysis report

Static analysis result for SHA-256 134d7783eb8a39b1…

MALICIOUS

PDF

84.5 KB Created: 2021-03-24 14:17:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2b11193789b50c74bb0d6b90538082ac SHA-1: ea1b1784cb6b1e66d7ba45cac55871a1e7cbb9d8 SHA-256: 134d7783eb8a39b1b1ab4f1ff9c8492f69ecba2fd8946ab6b41f7043c0055bf3
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to SEO-optimized PDF files, suggesting a link farm or redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and numerous external URIs suggest it's designed to lead users to potentially malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://jacksth.ru/award?keyword=business+benefits+of+cloud+computing+pdf
    • https://pojojupekofep.weebly.com/uploads/1/3/4/7/134754506/bojikabav-paloxa-zirerulikajo.pdf
    • http://vidavubaxo.22web.org/xosevijede.pdf
    • https://jononosafopobof.weebly.com/uploads/1/3/4/6/134649788/tixali_nalegojuxab.pdf
    • http://bitcoinlearningcentre.online/rock_climbing_gym_colorado_springsykodt.pdf
    • https://tumavogadagakep.weebly.com/uploads/1/3/4/7/134721967/cb54a13d68.pdf
    • https://negamevetafe.weebly.com/uploads/1/3/4/4/134439480/lajerefekedik.pdf
    • https://lepamume.weebly.com/uploads/1/3/4/8/134882258/1629937.pdf
    • https://koterevimudo.weebly.com/uploads/1/3/4/3/134342185/9765026.pdf
    • https://burigazipe.weebly.com/uploads/1/3/4/7/134764527/d3f1f705d5c7ccc.pdf
    • http://znalomstvavip.site/94097018289ncser.pdf
    • http://kyukty68.xyz/is_war_and_peace_the_longest_noveloukpb.pdf
    • http://pristav.pro/lamaribibajosutojajufuza384b7.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/megujobemegor/91761325533.pdf
    • http://pojasiw.rf.gd/sa_music_album_sites.pdf
    • https://s3.amazonaws.com/suxuzubojut/tofem.pdf
    • http://falowowujozaba.rf.gd/tear_soup_book.pdf
    • https://s3.amazonaws.com/fatikonavori/rekudajikew.pdf
    • https://uploads.strikinglycdn.com/files/4793b7ec-5ca7-4792-8750-e781bafc1571/how_much_money_does_a_starbucks_barista_make_a_month.pdf
    • https://uploads.strikinglycdn.com/files/4e889f68-54ba-4972-bffe-090f7d925d25/81301214416.pdf
    • https://s3.amazonaws.com/farokof/84511540288.pdf
    • https://s3.amazonaws.com/jolunenafobuw/dispute_credit_report_items.pdf
    • http://nokemineviwekus.rf.gd/77289952453.pdf
    • http://dijimati.rf.gd/roku_overview_premiere_vs._streaming_stick_vs._ultra_review_which_4k_roku_is_best.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_off0000ffea.bin
268d30c50b7afa56a081ef21a67cce6fb021a9114d90510e562a52381fc6fd94		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFFEA 5240 bytes
font_01_sfnt_off000111a6.bin
eb978cfa5db6effc5d926bfd90753359116a0bbc9bd68e94fc70e96823ccbbf3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x111A6 10808 bytes
font_02_sfnt_off00013674.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13674 4324 bytes

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