Malicious PDF — malware analysis report

Static analysis result for SHA-256 3352ca79ae9ebf77…

MALICIOUS

PDF

89.9 KB Created: 2021-01-19 05:57:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 7efd00c91d81950f91923a1541ae9555 SHA-1: 9f4322f3956675c90ae89f83c4bf6bc12a921e89 SHA-256: 3352ca79ae9ebf772d0b7ce2afc698ec8b1f361f33bfe75c2eb32c70e7038176
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV and an ML classifier as malicious, containing a large number of external links, many of which point to potentially malicious PDF files. The heuristic PDF_SEO_LINK_FARM indicates a link farm strategy, suggesting the document is designed to drive traffic to other sites. While no scripts were explicitly extracted, the presence of numerous external URLs and the nature of the heuristics strongly suggest a phishing or malware distribution attempt.

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://jottigo.ru/123?utm_term=hudson+community+television+hudson+campus PDF link annotation
    • https://cdn.sqhk.co/gadukupuwe/lmjbzhs/43064943453.pdfIn PDF document text
    • http://besuxiju.22web.org/pebumubawofi.pdfIn PDF document text
    • https://site-1176827.mozfiles.com/files/1176827/jubulesivalamisewajes.pdfIn PDF document text
    • https://tatonipek.weebly.com/uploads/1/3/4/8/134874136/vozarizok-sibufuj-jodabogaloxu-fubageguruf.pdfIn PDF document text
    • https://cdn.sqhk.co/rubovadu/gibOgiu/32355350877.pdfIn PDF document text
    • https://cdn.sqhk.co/rokunufoleti/hhsgcha/zunafu.pdfIn PDF document text
    • https://sumukekunazub.weebly.com/uploads/1/3/5/4/135400219/1114507.pdfIn PDF document text
    • https://tokafiwunan.weebly.com/uploads/1/3/4/3/134372509/pejap.pdfIn PDF document text
    • https://site-1180799.mozfiles.com/files/1180799/red_light_district_amsterdam_pictures.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/liguwubore/68289891816.pdfIn PDF document text
    • http://vopapatadape.epizy.com/mh_b._ed_cet_2018_application_form.pdfIn PDF document text
    • http://parezorizujax.rf.gd/bluetooth_update_for_macbook.pdfIn PDF document text
    • https://s3.amazonaws.com/gupojakami/kado_the_right_answer_opening.pdfIn PDF document text
    • https://s3.amazonaws.com/bulolimepol/vans_checkerboard_slip-_on_platform_trainers.pdfIn PDF document text
    • https://s3.amazonaws.com/vebenok/valkyrie_anatomia_the_origin_english_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/dazemi/paxurosexarilopirib.pdfIn PDF document text
    • https://s3.amazonaws.com/megujobemegor/kalamazoo_michigan_weather_report.pdfIn PDF document text
    • http://kagubosewox.epizy.com/trance_acapellas_free.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_off00011ee1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EE1 5340 bytes
SHA-256: 24197df8ffced3edab051a09d0fce21a9b2360bf939eb81cabf08cbf83f0da7a
font_01_sfnt_off000130f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130F1 12364 bytes
SHA-256: 63da96927a4bff086d189a8d63e5db6b92d3001ab127dfc75fc4604567e38a9f

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