Malicious PDF — malware analysis report

Static analysis result for SHA-256 75308a81890462ee…

MALICIOUS

PDF

102.9 KB Created: 2021-01-28 23:50:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 289cef774f7a8cdcdf1f3ed1e1513a6b SHA-1: 950155cbd1084a0bbe486f22b7e5c5ab579ec321 SHA-256: 75308a81890462eec77190c3a3047d0c63e73d32ff1632ce572483eafc0d4842
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating a high probability of maliciousness. The presence of a large number of external links, many pointing to PDF files, suggests a link farm or redirection mechanism. The primary IOC is the URL 'https://maypoin.ru/123?utm_term=sweat+zora+neale+hurston+text', which is likely used to direct users to a malicious site. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing or malware distribution attempt, potentially leveraging embedded JavaScript for exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://maypoin.ru/123?utm_term=sweat+zora+neale+hurston+text PDF link annotation
    • https://sebupemisopuba.weebly.com/uploads/1/3/4/7/134706320/3701999.pdfIn PDF document text
    • http://alfa-quest.ru/amaravati_kathalu_free_downloads9px6.pdfIn PDF document text
    • https://zunenevalomedo.weebly.com/uploads/1/3/4/8/134855990/ralafegubovolakokem.pdfIn PDF document text
    • http://ru-en.xyz/mokabunifesen2mkow.pdfIn PDF document text
    • http://glawerry.online/chess_master_gameboy1l81d.pdfIn PDF document text
    • http://vseti.life/my_star_planet_gamekzq23.pdfIn PDF document text
    • http://idealicait.site/5503115270ohevt.pdfIn PDF document text
    • http://apelsins.space/vomumud8z0bn.pdfIn PDF document text
    • http://gonzo-3d.com/icebreakers_ice_cube_gum_flavorscqov8.pdfIn PDF document text
    • http://pressit.fun/77585239310k7c3c.pdfIn PDF document text
    • http://differencecheats.net/picture_collage_making_software_free_downloadc62ta.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/jajuzasalikirut/avatar_maker_fury_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/tarizirefevifab/national_health_mission_logo.pdfIn PDF document text
    • https://s3.amazonaws.com/vukusa/btech_unisa_information_technology.pdfIn PDF document text
    • https://s3.amazonaws.com/vikukinumet/vekuk.pdfIn PDF document text
    • https://s3.amazonaws.com/gewuwasi/blaggers_guide_to_book.pdfIn PDF document text
    • https://s3.amazonaws.com/wumodukubaru/11182456746.pdfIn PDF document text
    • https://s3.amazonaws.com/kujapomib/erosional_landforms_types.pdfIn PDF document text
    • https://s3.amazonaws.com/mogipegi/xizeko.pdfIn PDF document text
    • https://s3.amazonaws.com/legipalofi/58816778681.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014ce9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CE9 2960 bytes
SHA-256: ba9dd86ad06677ef82b9fc66565cbe1db364e5caa8fb73f24ce3e10b7ab9a08b
font_01_sfnt_off0001576c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1576C 5088 bytes
SHA-256: ff7b76deb00e4eecf77adb1a6d3dece0163bc7c3f04b68bc47c3b5d52ed53641
font_02_sfnt_off000168cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x168CC 10784 bytes
SHA-256: 3f038618fdfaa4f6b9bf119f055e256777794950087afdf5bed1d49c22033773

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