Malicious PDF — malware analysis report

Static analysis result for SHA-256 7750052786f33c48…

MALICIOUS

PDF

83.9 KB Created: 2021-01-20 06:30:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: b3915316c792973b9b6132942b2e40a1 SHA-1: afeccdd6f77bed9211a8e6fd3d4679dda6b1f5b6 SHA-256: 7750052786f33c4892c759df8a1171687899a5f51a51a28f02c4c0488a7d72a1
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, many of which point to disposable hosting and are likely part of a link farm designed to drive traffic. One of the URLs, 'https://gettraff.ru/aws?utm_term=best+ebook+reader+for+android+quora', is identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution via these links.

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
  • 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.
  • 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.
  • 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=best+ebook+reader+for+android+quora In PDF document text
    • https://static.s123-cdn-static.com/uploads/4455178/normal_5fdff05c1d508.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418188/normal_5ff1b8dd9fd52.pdfIn PDF document text
    • https://site-1173584.mozfiles.com/files/1173584/kodusodozemokawu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371497/normal_5f8b3e6461db7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459036/normal_5fe5cf7a67fae.pdfIn PDF document text
    • https://naruvemekojesez.weebly.com/uploads/1/3/4/6/134685524/95d72aaecd351c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384046/normal_5f99def875c83.pdfIn PDF document text
    • https://sugelazo.weebly.com/uploads/1/3/4/7/134767002/46bda9dd42414.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374696/normal_5f9328ed7226a.pdfIn PDF document text
    • https://fofagova.weebly.com/uploads/1/3/4/3/134313529/nagexes.pdfIn PDF document text
    • https://site-1171806.mozfiles.com/files/1171806/soccer_world_cup_2020_live_football_match_2019.pdfIn PDF document text
    • https://site-1199825.mozfiles.com/files/1199825/moto_x3m_2_unblocked.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424935/normal_5fb264f4360cd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379241/normal_5f96d19def957.pdfIn PDF document text
    • https://site-1173371.mozfiles.com/files/1173371/graphical_analysis_of_motion_answer_key.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lojosikol.epizy.com/game_battlefield_4_apk.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_off00010b03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B03 5248 bytes
SHA-256: 7fdf5c9f423d644c83667117bce6f48174b79ef5d4b72467c50d77748f84f5c1
font_01_sfnt_off00011ce6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CE6 11100 bytes
SHA-256: 91b78d3abf9678588ef7a4c8334207c6b19ef9eda2f0188c67d8587a8eeb87e0

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