Malicious PDF — malware analysis report

Static analysis result for SHA-256 4966904cb8cacee1…

MALICIOUS

PDF

72.7 KB Created: 2020-11-24 00:50:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9b6f2d535722b009f807e534346a739a SHA-1: ec4cf63b5cb2ca6555dcca62a45504eb919c83a7 SHA-256: 4966904cb8cacee199bcd4449daa1941de32ecae7eecd066344d80025d81c535
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with several pointing to known malicious redirectors and link farms. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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://cctraff.ru/123?utm_term=mhw+iceborne+release+time+ps4
    • https://dutajidadu.weebly.com/uploads/1/3/4/7/134730474/sodokazid.pdf
    • https://jukawowirorab.weebly.com/uploads/1/3/4/6/134662443/bibokude.pdf
    • https://cdn-cms.f-static.net/uploads/4384310/normal_5f8bfa91f341e.pdf
    • https://sokuvotaboraj.weebly.com/uploads/1/3/0/7/130776263/firinaluxesat-daxumur.pdf
    • https://xesaranit.weebly.com/uploads/1/3/2/6/132696194/zegugumufite.pdf
    • https://cdn-cms.f-static.net/uploads/4366022/normal_5f87d548ba704.pdf
    • https://zivatexoriku.weebly.com/uploads/1/3/4/8/134850237/6215251.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/zobuwubedak/load_word_assembly.pdf
    • https://s3.amazonaws.com/satedafadusizo/zawidufupusunitunu.pdf
    • https://s3.amazonaws.com/visagogijulep/jodetop.pdf
    • https://s3.amazonaws.com/mizeteb/benefits_of_reading_20_minutes_a_day.pdf
    • https://uploads.strikinglycdn.com/files/dc69c698-f3ed-4adc-a887-9370ecfcafa0/soxabitofixenudosu.pdf
    • https://s3.amazonaws.com/patotale/mr._lewis_stem_school_administrator_32073.pdf
    • https://s3.amazonaws.com/xesigeze/male_hanbok_hat.pdf
    • https://s3.amazonaws.com/somamere/nojawududurokorafujeb.pdf
    • https://s3.amazonaws.com/titugome/77118783831.pdf
    • https://s3.amazonaws.com/tiluwisulepam/alum_creek_state_park_boat_rental.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df34.bin
038b9b66d2e3b852ef56c14fa0b798e9cd272a502b48443684a8cd25c9bdb278		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF34 5496 bytes
font_01_sfnt_off0000f1d8.bin
2dd1fdd268e81ac6f52edb74e10cf66e930efed90c44d4b284f5dfce7e06d9a7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D8 10388 bytes

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