Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8f8b9313e2d470f…

MALICIOUS

PDF

68.5 KB Created: 2021-03-15 16:07:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 7bb56c07faae7533c843893e87fb87c2 SHA-1: 051fb62c9895ea9c41a39ac1198f54c0b50a91ab SHA-256: d8f8b9313e2d470f4fbf754eb6658cc536f1091f15c904b8b70d825d26000809
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. The PDF contains numerous embedded URLs pointing to disposable domains, a common tactic for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior, suggesting the document's primary purpose is to redirect users to potentially harmful sites.

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 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://mezovuduw.ru/strik?utm_term=words+that+start+with+xau PDF link annotation
    • http://aov.one/55437298886oeksd.pdfIn PDF document text
    • http://tiktoktop.design/quadratic_inequalities_worksheet_answer_key5x9du.pdfIn PDF document text
    • http://keto-menu.online/wodemalzz5sl.pdfIn PDF document text
    • https://mewukonil.weebly.com/uploads/1/3/4/0/134096476/540a7c59b.pdfIn PDF document text
    • http://4kuhd.me/231436654335u279.pdfIn PDF document text
    • http://lovewaits.ru/rugisisegulegixedilolizigaeij.pdfIn PDF document text
    • http://dezlice.ru/35546552610traeu.pdfIn PDF document text
    • https://mafobosapufi.weebly.com/uploads/1/3/4/5/134505980/jevaf-nepatadotigo.pdfIn PDF document text
    • http://fruitnaturs.space/989905235763h76z.pdfIn PDF document text
    • http://albl.ru/free_sheet_music_beethoven_fur_elise166oj.pdfIn PDF document text
    • http://verefdliyvtorogo.xyz/gefimexoderunmqxwd.pdfIn PDF document text
    • http://rcasino.info/bapufoxewupikurabineximia3tr2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/73a01062-3bdf-484d-bb18-b31f4b5b6a5b/78881799432.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6fea9872-16bc-41cc-907e-73feff375516/totebomema.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9ad6c46-4154-4268-953e-8933c4fd87d8/salen_and_zimmerman_rules_of_play.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/147af2d1-c6d0-4a79-8d12-6acf8ca95704/danby_designer_dcr044a2bdd_compact_refrigerator_4.4-cubic_feet_black.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7b6e9e4-d268-43f3-9279-caf8696a4647/what_is_electronic_media_meaning_in_urdu.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_off0000c6b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6B9 5052 bytes
SHA-256: 1652b2f154fc758ddbc0996d2adfb47fdb6914a9069d259afc0266d6222e12e4
font_01_sfnt_off0000d7fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7FD 18692 bytes
SHA-256: 7db82317a180bd16c566e5025df8f0f1ea79b722e4b69cbc08bdf1d68782f6d6

Open this report in the interactive analyzer, or submit your own file for analysis.