Malicious PDF — malware analysis report

Static analysis result for SHA-256 2571d77d9adada0e…

MALICIOUS

PDF

80.5 KB Created: 2021-01-21 03:16:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ffd347a4e9921c2349763e6af3a2a1e7 SHA-1: ef8c39edbecdbdf11a6a483caddba59838083b29 SHA-256: 2571d77d9adada0eba2e65fdd747972679b734b0dc65fffd2e040cc3c326a545
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files hosted on various platforms, indicating a link farm or redirection strategy. One critical heuristic identified a link to known malicious redirector infrastructure, suggesting the primary purpose is to lead users to malicious sites. Although no scripts were explicitly extracted, the PDF structure and the presence of numerous external links strongly suggest an attempt to exploit users through deceptive content, likely for phishing or malware distribution.

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ggtraff.ru/aws?utm_term=academic+journal+cover+template
    • https://ziwagunu.weebly.com/uploads/1/3/4/8/134883986/sanegelodised.pdf
    • https://cdn-cms.f-static.net/uploads/4448718/normal_5fb4dee12bbae.pdf
    • https://static.s123-cdn-static.com/uploads/4502268/normal_600840ce10af0.pdf
    • https://kejarokelevu.weebly.com/uploads/1/3/5/2/135297316/ruwazuv-dunokawu.pdf
    • https://cdn-cms.f-static.net/uploads/4383924/normal_5fd9407d08030.pdf
    • https://cdn-cms.f-static.net/uploads/4379380/normal_5fa60596409f2.pdf
    • https://site-1245699.mozfiles.com/files/1245699/breaking_dawn_part_1_full_movie.pdf
    • https://tojisoma.weebly.com/uploads/1/3/5/3/135330836/lakirax.pdf
    • https://site-1173692.mozfiles.com/files/1173692/stickman_fighter_3d_2018_mod_apk.pdf
    • https://cdn-cms.f-static.net/uploads/4448985/normal_5fdbd1f57eefd.pdf
    • https://site-1183491.mozfiles.com/files/1183491/basketball_world_cup_game_online.pdf
    • https://cdn-cms.f-static.net/uploads/4412592/normal_5fc12ffe11658.pdf
    • https://site-1255859.mozfiles.com/files/1255859/6654385362.pdf
    • https://site-1172154.mozfiles.com/files/1172154/after_school_app.pdf
    • https://cdn-cms.f-static.net/uploads/4369908/normal_5f9028550342b.pdf
    • https://sefaxamijewosaw.weebly.com/uploads/1/3/2/6/132682716/3470319.pdf
    • https://site-1177897.mozfiles.com/files/1177897/temabikugapasuzotimaju.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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_off0000fe3a.bin
f123f699d45e174c368c84c9dd5aaa6186ee772ca815ab604b4ab83748cf742c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE3A 5164 bytes
font_01_sfnt_off00010fc5.bin
a74e039a4c5f5ad188057db1b8789765838aa01c178e26c5651f83e33be746e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10FC5 10720 bytes

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