Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebf680778fea5c0c…

MALICIOUS

PDF

64.9 KB Created: 2020-12-16 16:22:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0b4e7019a7ddfd366beeb850ecdfba60 SHA-1: 78136d11f9e0cf28041176ae0030a328ecc62708 SHA-256: ebf680778fea5c0c4e5db492e242efbb49af4b26883dcea92165dfbda7836a27
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool sometimes used to create malicious PDFs.

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://gettraff.ru/aws?utm_term=merriam+webster+learner%2527+s+dictionary+free
    • https://vadanuburizupi.weebly.com/uploads/1/3/4/9/134901301/a2c7330430.pdf
    • https://jabiratunibi.weebly.com/uploads/1/3/2/6/132683422/bc00e3fac5bb8d8.pdf
    • https://puperoriwob.weebly.com/uploads/1/3/4/7/134715375/e0f23d681f5d21.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/88c6109c-c02d-494c-bb7c-3a8b76106ac2/92316608859.pdf
    • https://uploads.strikinglycdn.com/files/bd590e92-65e8-4f70-b935-57cc6fd7c849/fisher_price_jump_for_lights_and_music_recall.pdf
    • https://static1.squarespace.com/static/5fc5b65d6609fd0ee7b27781/t/5fcd2901fe657040d59a7192/1607280897039/16673411856.pdf
    • https://s3.amazonaws.com/sisaxu/alchemist_drinks_menu.pdf
    • https://s3.amazonaws.com/luborinizu/43476832738.pdf
    • https://s3.amazonaws.com/lijulijowivaze/calendario_de_siembra_mexico_2018.pdf
    • https://uploads.strikinglycdn.com/files/2031b1e4-72db-461f-a813-d535bea8fbc0/rugogugavavikoti.pdf
    • https://s3.amazonaws.com/jukezeluf/cheapoair_contact_information.pdf
    • https://uploads.strikinglycdn.com/files/294a594f-f0a1-430e-9827-c799c24e3dc6/lifebovoj.pdf
    • https://s3.amazonaws.com/wulotugadag/16015557809.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_off0000bd86.bin
f4957f5d2faea73d701569a98318e60a9c1300706ca74e318924115015da5572		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBD86 5540 bytes
font_01_sfnt_off0000d06d.bin
016e4de755a367bd388f4eb9c6bd3f6d970f16b9a7354df677dffd25b88accdc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD06D 11340 bytes

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