Malicious PDF — malware analysis report

Static analysis result for SHA-256 b78ba6bc15f39fa7…

MALICIOUS

PDF

71.4 KB Created: 2021-02-27 21:10:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: f7a7249ff2b7776759efbb28654ea83c SHA-1: 5a56aadbf7219d4e4e5b54533fea2b0c4dd204a8 SHA-256: b78ba6bc15f39fa7eabb81d1e867ff317b9f89be49252faa8244ae949319e387
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a critical heuristic identifying a link to known malicious redirector infrastructure. The ML classifier and ClamAV also flagged this PDF as malicious, indicating a phishing or malware distribution attempt. While no scripts were extracted, the sheer volume of disposable links and the presence of redirectors strongly suggest a malicious intent to lure users to harmful sites.

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
  • 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 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://dafemum.ru/strik?utm_term=optics+textbook+hecht In PDF document text
    • https://cdn-cms.f-static.net/uploads/4407084/normal_600ff39adccf5.pdfIn PDF document text
    • https://vurofagulomefu.weebly.com/uploads/1/3/1/4/131452840/294bda3738.pdfIn PDF document text
    • http://p-kavkaza.ru/7475078843mzzw0.pdfIn PDF document text
    • http://goldenframecollision.com/juliette_marques_de_sade_gratisa8gpa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447101/normal_602e660b6115f.pdfIn PDF document text
    • https://fosubenasodu.weebly.com/uploads/1/3/4/0/134097760/a0f72.pdfIn PDF document text
    • https://zewugijisisu.weebly.com/uploads/1/3/4/8/134885238/5831606.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486552/normal_5fdc56e524868.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471711/normal_6023f5cf552e3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405929/normal_5ff92cf1c1ba3.pdfIn PDF document text
    • http://koprovk.xyz/what_is_the_importance_of_sound_in_our_daily_life94rij.pdfIn PDF document text
    • https://zeruwowigewal.weebly.com/uploads/1/3/0/8/130813736/lorefezizuvetedoda.pdfIn PDF document text
    • http://olipaka.xyz/dosukemixx3ygn.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487197/normal_6000a2fa9f2f9.pdfIn PDF document text
    • http://lisolu.org/23531924966ktiiz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449419/normal_6014c36946e71.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/bagokiko/avanza_veloz_2015_manual_jakarta.pdfIn PDF document text
    • https://s3.amazonaws.com/xidazeze/arthdal_chronicles_episode_1_eng_sub.pdfIn PDF document text
    • https://s3.amazonaws.com/zozuxukoxo/daniv.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_off0000dd65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD65 4980 bytes
SHA-256: add48595bd4b63c2ea3c5d1a468d164aff6f4918d9b80022ac02bb870d79424b
font_01_sfnt_off0000ee57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE57 10080 bytes
SHA-256: f63a7885e2125fb8694a0d2dca4116b5318bfeb44cf7256966821306eaf97bc2

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