Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5b1ac6ac18c5736…

MALICIOUS

PDF

78.1 KB Created: 2021-03-11 05:43:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e5565fb1ac89d4198fb4554d7e19b57b SHA-1: 1af01db659173a2aa392212632568fb01ff9b42a SHA-256: f5b1ac6ac18c5736c04d1a905f68a59978dada88c0061bd80cece264110e8c40
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are obfuscated or lead to suspicious domains, indicating a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though partially corrupted, contains references to 'wkhtmltopdf' and 'Qt', suggesting it was generated programmatically to host these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://resalured.ru/123?utm_term=apoplej%25C3%25ADa+pituitaria+pdf
    • https://tofaxewa.weebly.com/uploads/1/3/4/6/134672655/kizoxosilojo.pdf
    • http://tadajixilatu.scienceontheweb.net/vuxegafasurez.pdf
    • http://nupesupo.mypressonline.com/mesojofosiwokusegedi.pdf
    • http://navaram.online/10829892857birod.pdf
    • http://tupaxeguna.scienceontheweb.net/stephen_king_the_outsider_reviews.pdf
    • http://pek-24.cc/how_to_install_american_megatrends_bios0v484.pdf
    • https://vedexojofidas.weebly.com/uploads/1/3/4/5/134581268/dfd400b9d6af.pdf
    • http://xawegap.mywebcommunity.org/bd-j5100_blu-ray_player_wifi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/9177af11-72cf-4196-9431-c90f9a23a948/samsung_55-inch_q70t_4k_qled_smart_tv_reviews.pdf
    • https://s3.amazonaws.com/vuterijoze/kobelovazopopazudovin.pdf
    • https://s3.amazonaws.com/gulapore/88427934530.pdf
    • https://s3.amazonaws.com/jivagajamav/gawanaxuli.pdf
    • https://uploads.strikinglycdn.com/files/02962be0-eb28-410b-be82-37a519daf9d1/tokiweparuxemow.pdf
    • https://s3.amazonaws.com/fifuto/75253814277.pdf
    • https://s3.amazonaws.com/juduk/ielts_writing_task_2_template.pdf
    • http://nojikigor.myartsonline.com/drow_5e_names.pdf
    • https://uploads.strikinglycdn.com/files/039f5858-e376-4346-a73a-37cd23ab8b0d/32772517022.pdf
    • https://uploads.strikinglycdn.com/files/b345aa83-4f23-4e91-b1c8-4021445c22b3/98716955356.pdf
    • https://s3.amazonaws.com/tufujifinobiro/dillon_650_parts_manual.pdf
    • https://s3.amazonaws.com/wutezigojuxi/mupuxibarolis.pdf
    • https://s3.amazonaws.com/megujobemegor/banjul_airport_arrivals_information.pdf
    • https://s3.amazonaws.com/lorugipopuxe/forever_armon_and_trey.pdf
    • https://uploads.strikinglycdn.com/files/d54e7ede-f001-4536-b354-b73000743832/jobiruvegimokezo.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_off0000e558.bin
c5f4ff6d6643fafa78d01420d2028f2af2ef1da0e5ea4f060edf4ef3fc451dbe		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE558 4752 bytes
font_01_sfnt_off0000f598.bin
5c5f25ab85ae2be8b505441967933374147fca7b976220c83f437e4edbf61734		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF598 11256 bytes
font_02_sfnt_off00011a76.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11A76 4324 bytes

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