Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff3511f91624f6b7…

MALICIOUS

PDF

80.5 KB Created: 2021-02-23 22:52:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 5fb0798f591b0909f24a7ac12eb8b68a SHA-1: c413495c60c67466a3fc89269229785468465218 SHA-256: ff3511f91624f6b7018fa7532899a294adb233d9edcc320a543689c19d45b561
186 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 hosted on disposable domains, indicating a link farm designed to direct users to potentially malicious websites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and numerous external URIs are indicative of techniques used to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://jottigo.ru/123?utm_term=the+wheel+of+time+casting+news PDF link annotation
    • https://mixowobigasobu.weebly.com/uploads/1/3/1/1/131164278/witokepapefuzub-lesexi.pdfIn PDF document text
    • http://zekabivalejasaj.22web.org/amd_catalyst_control_center_linux.pdfIn PDF document text
    • https://lasebotoxuxuxir.weebly.com/uploads/1/3/4/7/134729765/birokedox.pdfIn PDF document text
    • https://cdn.sqhk.co/jezuleku/mifGhgh/mavajizudarawa.pdfIn PDF document text
    • https://cdn.sqhk.co/rufadexu/icb3rb0/terminator_genisys_future_war_cheats.pdfIn PDF document text
    • https://cdn.sqhk.co/gewanunu/mgja6Z0/98063583066.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384821/normal_5feb835ea7673.pdfIn PDF document text
    • https://rofikilidoxomuk.weebly.com/uploads/1/3/4/0/134017179/d52d6e05db8.pdfIn PDF document text
    • http://nijeratazuw.iblogger.org/20689417845.pdfIn PDF document text
    • https://cdn.sqhk.co/fowijuseziju/gdijBLg/cardboard_boxes_with_lids_and_handles.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374369/normal_602881e92603d.pdfIn PDF document text
    • https://cdn.sqhk.co/tejurorado/idJMBja/kejinosipajudet.pdfIn PDF document text
    • https://cdn.sqhk.co/vakusukereju/iOljxgb/the_glass_room_movie_review.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/bupaxomu/capitalization_practice_worksheet_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/nakuzafol/nirexog.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_off0000f326.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF326 5028 bytes
SHA-256: a76e6260a2f35e5e738465fb25e4d948d917e63d937b981a4cd0586d70a41017
font_01_sfnt_off0001042e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1042E 10128 bytes
SHA-256: cf75aa4cf4b4d2a576d141952c223caed6c52ad83e0547a7e6b780eae45c3c13
font_02_sfnt_off000126e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126E5 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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