Malicious PDF — malware analysis report

Static analysis result for SHA-256 87ee82ca7438c9ef…

MALICIOUS

PDF

74.6 KB Created: 2021-01-13 13:45:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 172b6754ec9f6df1070920f6182aaaa1 SHA-1: 602c7fe792843507265d420a99f1e4fb5b37d8cf SHA-256: 87ee82ca7438c9efed653b920191c663d9271d52608ee881b6edae6b159a3a27
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one pointing to 'trafftec.ru', suggesting an attempt to redirect users to a malicious site. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF's structure is designed to host multiple links, reinforcing the phishing or malware distribution intent.

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://trafftec.ru/wb?keyword=franchise%20hockey%20manager%206%20playable%20leagues PDF link annotation
    • https://site-1168079.mozfiles.com/files/1168079/detention_netflix_cast.pdfIn PDF document text
    • https://site-1178798.mozfiles.com/files/1178798/atlassian_design_style_guide.pdfIn PDF document text
    • https://site-1168031.mozfiles.com/files/1168031/cameroon_gospel_music.pdfIn PDF document text
    • https://site-1196011.mozfiles.com/files/1196011/sword_art_online_fatal_bullet_walkthrough_guide.pdfIn PDF document text
    • https://site-1176151.mozfiles.com/files/1176151/rome_total_war_2_emperor_edition_review.pdfIn PDF document text
    • https://site-1177129.mozfiles.com/files/1177129/skinstore_us_reviews.pdfIn PDF document text
    • https://fisegumatiwal.weebly.com/uploads/1/3/4/7/134722042/a6214f20d.pdfIn PDF document text
    • https://cdn.sqhk.co/navififoro/Phh5Rpo/suzizafopakaraxuwem.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445104/normal_5fe0ec18a1f83.pdfIn PDF document text
    • https://laropavo.weebly.com/uploads/1/3/4/5/134585926/liwopamoju.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/falufusu/broadmoor_middle_school_website.pdfIn PDF document text
    • https://s3.amazonaws.com/degagaziv/weapons_and_warriors.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_off0000e2aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2AA 5760 bytes
SHA-256: 433c889603cb1886071a1d622a905cfb790d37979eb8db832ca7d9b39b1caa18
font_01_sfnt_off0000f61e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF61E 11448 bytes
SHA-256: 3962d501cf2d16c0019c8d361c39cb5e877caa6c57159dac83956d57fd167348

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