Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cd6661ca2bf1746…

MALICIOUS

PDF

80.1 KB Created: 2021-04-07 07:58:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: a2bb4fa18efc459414bb5e1b73b8293c SHA-1: 508e8b471ce9e9d2982e82f03174ddd02e412290 SHA-256: 5cd6661ca2bf17461b2c0390bdaa3f3c733d7e3af271c85998bcb1dd7942227a
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • 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://bologen.ru/wix?keyword=2003+ap+calculus+bc+free+response+question+6 PDF link annotation
    • http://pristav.pro/fluke_77_user_manualducrl.pdfIn PDF document text
    • http://about-fb-support.com/prodigy_math_game_hacks_20202b82x.pdfIn PDF document text
    • http://faripofijukevom.mywebcommunity.org/17553504534.pdfIn PDF document text
    • http://gallery-shop.site/how_to_decorate_a_white_christmas_tree_in_bluelne8l.pdfIn PDF document text
    • http://nesobaka7.xyz/university_physics_volume_2_answersl2yxf.pdfIn PDF document text
    • http://clubstore.info/dexix63r8f.pdfIn PDF document text
    • http://xalowazejadiv.getenjoyment.net/action_research_report_for_b._ed_students.pdfIn PDF document text
    • http://wwwbcpzonasegura-viabcp.com/98421795846ftmab.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://luxupuxud.myartsonline.com/nietzsche_gay_science_summary.pdfIn PDF document text
    • https://b54663a3-ff9d-4122-b75c-69b71428c9b0.filesusr.com/ugd/cfa91a_891d2564175e48a9ba4c1856a4cdaca4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rixevozajixezos/40268361390.pdfIn PDF document text
    • https://8c4778c4-ed17-4cf1-86f9-5448e21c5c15.filesusr.com/ugd/6da380_3e0d5322a38f46198a3d43d5ea5d2396.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vofadoloves/48440543077.pdfIn PDF document text
    • https://s3.amazonaws.com/towakog/mivavabokovoji.pdfIn PDF document text
    • https://s3.amazonaws.com/jepinebawo/ccna_filetype.pdfIn PDF document text
    • https://s3.amazonaws.com/tixedujegibex/reviews_on_onn_cd_mini_stereo_system.pdfIn PDF document text
    • https://s3.amazonaws.com/zidosozawok/estudio_agrologico.pdfIn PDF document text
    • https://f733e552-90a1-4d1f-83ca-a6b36afcf31c.filesusr.com/ugd/38bf1f_4e3bf797cd4e48779333131201f25ff6.pdf?index=trueIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e478.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE478 5772 bytes
SHA-256: 816798cc2a282e0e886725276e102a0b8f4987849ba309618529f3671e122156
font_01_sfnt_off0000f828.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF828 10800 bytes
SHA-256: 6eb41fd2f3f278436ebba8ce89c95461e42f17cae786e08ab3229b4194cd0f2a
font_02_sfnt_off00011d51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D51 16204 bytes
SHA-256: 31aa257675234f953cb39254c73a0c002637764ec2691c470e0912636c3685cf

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