Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfe3b4d2f025393d…

MALICIOUS

PDF

66.0 KB Created: 2021-06-10 00:10:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 592a0bce8646747ecda0e13c58dcc153 SHA-1: 206d3175a87fb136144d72d32328e3fedfd2ae4c SHA-256: dfe3b4d2f025393d295a747e56d73457f306f6ade03e9194e4d52fc68287a9c4
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. The embedded URLs and the structure of the PDF point towards an attempt to manipulate search engine results or trick users into visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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.
  • 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://drafthe.ru/pbw?utm_term=cheat+db+ppsspp+android PDF link annotation
    • https://nonegila.weebly.com/uploads/1/3/4/7/134702729/3311119.pdfIn PDF document text
    • https://detaxotipag.weebly.com/uploads/1/3/4/7/134730838/f7035b5e2fcd496.pdfIn PDF document text
    • https://loxufoxoxow.weebly.com/uploads/1/3/5/9/135982175/7050806.pdfIn PDF document text
    • https://winimotewo.weebly.com/uploads/1/3/4/5/134593518/e7ef316f3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417141/normal_604a565e72d22.pdfIn PDF document text
    • https://kikebepuziji.weebly.com/uploads/1/3/0/7/130775256/082ac8c1072.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458616/normal_5fd04f6fa30f1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444110/normal_60b9688e431e1.pdfIn PDF document text
    • https://gesunewa.weebly.com/uploads/1/3/1/4/131438127/218f02cc227e.pdfIn PDF document text
    • https://bawusazatodopam.weebly.com/uploads/1/3/1/3/131378774/jikudowuxeselovitisa.pdfIn PDF document text
    • https://mawosamaretezij.weebly.com/uploads/1/3/4/8/134860838/gefabuje-bavipo-depizagolal.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464541/normal_6021871caf09b.pdfIn PDF document text
    • https://nuvomananakoleg.weebly.com/uploads/1/3/1/4/131453817/0fcfb711510b7ce.pdfIn PDF document text
    • https://ritobawen.weebly.com/uploads/1/3/4/4/134486043/4412968.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ecf82713-1eb2-4450-b099-51f883587abd/25473894969.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/644b1961-9671-42f1-b888-cb8c72e75d83/craftsman_19.5_hp_riding_lawn_mower_oil_change.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62da4208-8148-49cd-9eba-6f22eb53830c/letra_y_acordes_de_alabanza_el_poder_del_cristiano.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1002b6c9-8e6b-4542-bbaa-ce2d9ede8477/76995490763.pdfIn PDF document text
    • http://kakewizajupe.pbworks.com/w/file/fetch/144532623/graphing_systems_of_linear_equations_worksheet_answers.pdfIn PDF document text
    • http://mavujeridolu.pbworks.com/f/mopitozojo.pdfIn PDF document text
    • http://nuwiwaweber.pbworks.com/w/file/fetch/144992994/176312646.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/512895d1-b77a-4c9f-8dcd-d6b1eba9c617/braun_silk_epil_9_dual_epilator_price_in_pakistan.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_off0000c751.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC751 5060 bytes
SHA-256: ddb791d0e956bec11fc2c5ec0451b04390204d9f5300b90f39c6342cc4a197ef
font_01_sfnt_off0000d86e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD86E 10008 bytes
SHA-256: acb0ff1c1b6f6428f0036d2104c6ebe8149f955ea84a7184146c5093b010f27f