Malicious PDF — malware analysis report

Static analysis result for SHA-256 50549abaa0e8cf09…

MALICIOUS

PDF

80.8 KB Created: 2021-01-25 23:27:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 724d6de2304ffdaa0ac626d290fb0f11 SHA-1: 953f4b6f50a714a95b210684c8c79527381168d1 SHA-256: 50549abaa0e8cf09a8a2c83a8036fa52afff5e5625668d12fd9e4b17821fe833
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to disposable domains and link farms, suggesting a phishing or malware distribution scheme. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the PDF is structured as a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://trafffe.ru/123?utm_term=trinity+ring+meaning PDF link annotation
    • http://soinjaga.ru/utopia_season_2_review4yjoz.pdfIn PDF document text
    • http://tricitysikhs.com/72835339975egm17.pdfIn PDF document text
    • https://cdn.sqhk.co/delojiwuguj/D77Zbjc/40917781541.pdfIn PDF document text
    • https://gunagabivap.weebly.com/uploads/1/3/4/8/134863042/1c95194029a.pdfIn PDF document text
    • http://itwomen.space/51344823654vjhic.pdfIn PDF document text
    • https://sukanoxe.weebly.com/uploads/1/3/1/4/131453950/1344399.pdfIn PDF document text
    • http://wtia.space/seesaw_family_app_qr_code_won_t_scan1472t.pdfIn PDF document text
    • https://cdn.sqhk.co/sebixodof/haTgcie/advance_auto_parts_phone_number_nearest_me.pdfIn PDF document text
    • https://badetujunomut.weebly.com/uploads/1/3/1/8/131857650/ronuduvubujugisuk.pdfIn PDF document text
    • https://ludalobupum.weebly.com/uploads/1/3/4/5/134528654/7673918.pdfIn PDF document text
    • https://toxilitabosi.weebly.com/uploads/1/3/4/4/134495834/8100577.pdfIn PDF document text
    • http://microdigitalmeter.xyz/blood_infection_in_baby_treatmentk0niq.pdfIn PDF document text
    • http://fortuneo-enligne.com/frogger_2_gameboyxa67c.pdfIn PDF document text
    • https://koropiliful.weebly.com/uploads/1/3/0/7/130740252/4451343.pdfIn PDF document text
    • https://cdn.sqhk.co/netimawifes/XsRXbir/transport_tycoon_ios_tips.pdfIn PDF document text
    • https://cdn.sqhk.co/rosomugimo/JQhghel/ruvederadikipob.pdfIn PDF document text
    • http://mrshadow.net/wood_cutter_pro_reviewsbrqwa.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/jijari/54386143248.pdfIn PDF document text
    • https://s3.amazonaws.com/dumupa/nuevas_tecnologas_de_la_informacin_en_ingls.pdfIn PDF document text
    • https://s3.amazonaws.com/kitakilesa/10821233335.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_off0001005d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1005D 4844 bytes
SHA-256: e92985656ad20be3fa615cd9eb5a24c092c85e5421873958f0d95d8242ec7c86
font_01_sfnt_off000110cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110CC 11012 bytes
SHA-256: 90477aedc727d06717b2f5575a6af81cde65d9ce4e5cebf5c535c6bdb2642f73

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