Malicious PDF — malware analysis report

Static analysis result for SHA-256 297341ef4a7146bc…

MALICIOUS

PDF

81.4 KB Created: 2021-04-04 13:44:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: ba17258f50cf583ce9ae001878cdbfcd SHA-1: 1dc13ca5e0792e848b78f2b78f6eaa2da68ea3ba SHA-256: 297341ef4a7146bcca80b51f897a4b38d07d0aa4775b680246bf250ab10bb671
136 Risk Score

Malware Insights

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

The PDF contains suspicious links and is flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The presence of external URIs and an invisible link to a suspicious domain suggests an attempt to redirect the user to a malicious payload. The document body, though heavily obfuscated, contains text related to a worksheet, indicating a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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://fokemale.ru/wix?keyword=writing+two+variable+inequalities+worksheet PDF link annotation
    • http://andyhong.blog/fall_doodle_coloring_sheetszea4p.pdfIn PDF document text
    • http://managerprogram.live/relixokutopoxuwakumubare4xeo.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/qCFbfIF/free_funeral_program_brochure_psd_template.pdfIn PDF document text
    • http://edayafar.xyz/nancy_drew_books_online_free_downloado4nva.pdfIn PDF document text
    • http://copyrightram.net/mizibuvifegolefwoys.pdfIn PDF document text
    • https://cdn.sqhk.co/xumelesep/gh7rhee/zekenewil.pdfIn PDF document text
    • https://cdn.sqhk.co/dukosisevu/awjbhjP/road_legal_crosser_125_finance.pdfIn PDF document text
    • http://xewaxoweva.22web.org/99846640072.pdfIn PDF document text
    • https://cdn.sqhk.co/gobavata/ieShcgg/95218898657.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/dalava/15822626845.pdfIn PDF document text
    • https://s3.amazonaws.com/sedowedi/7738365454.pdfIn PDF document text
    • https://s3.amazonaws.com/bejenosugede/diablo_3_gear_guide_demon_hunter.pdfIn PDF document text
    • https://s3.amazonaws.com/zerepuzuze/35790157593.pdfIn PDF document text
    • http://sivadanoxibive.epizy.com/haunted_house_2_game.pdfIn PDF document text
    • https://s3.amazonaws.com/pazatuv/sexowumepizutiniladufub.pdfIn PDF document text
    • https://s3.amazonaws.com/lorugipopuxe/no_cable_tv_guide_springfield_mo.pdfIn PDF document text
    • https://s3.amazonaws.com/lixuzo/how_do_i_redeem_my_staples_rewards.pdfIn PDF document text
    • https://s3.amazonaws.com/paxunu/close_up_b1_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/vobuturinivi/78028609310.pdfIn PDF document text
    • https://s3.amazonaws.com/tapelu/gigavonefat.pdfIn PDF document text
    • https://s3.amazonaws.com/bisegilupuf/is_secretariat_male_or_female.pdfIn PDF document text
    • https://s3.amazonaws.com/rikolesafuwofar/28456918517.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fda3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDA3 5440 bytes
SHA-256: df3814c191a37a0ffabf11b4ea27fea2c6de0bb16e9582de6b034080ae387e33
font_01_sfnt_off00011039.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11039 11652 bytes
SHA-256: 2fc5f6624ef6441e8b1d77517bb1116ac7775a1045de6c19aab9496e7e3d4891

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