Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c7524eca976018a…

MALICIOUS

PDF

69.9 KB Created: 2021-01-18 04:39:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 04db25df295d1d9b363373c717406cf8 SHA-1: bdcf815c9f950d9f20433eb1de8c9f4dbcdb64b7 SHA-256: 6c7524eca976018a585e8a41c2d6e129b33a41c80b59e7046dc124abba045a3c
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links pointing to suspicious domains, with one identified as a known malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, and the embedded links are presented in a way to mimic search results, aiming to trick users into visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffine.ru/123?utm_term=cisco+small+business+rv220w+manual In PDF document text
    • https://cdn-cms.f-static.net/uploads/4369164/normal_5f8908d0510da.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464873/normal_5ff13e03e894e.pdfIn PDF document text
    • http://faxagigotitij.66ghz.com/44857229494.pdfIn PDF document text
    • https://kapiluruge.weebly.com/uploads/1/3/4/6/134672566/1154383.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379610/normal_5fd7d3a463f20.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420939/normal_5ff94370efd15.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422168/normal_5fad9854ad6b7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453098/normal_5fa0c494b4ec2.pdfIn PDF document text
    • https://cdn.sqhk.co/mibuxedufexi/xighhpD/best_tumblr_themes_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/zopimoforaja/fidjgha/earthlink_satellite_internet_reviews.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/fatikonavori/sivusakir.pdfIn PDF document text
    • http://pitugozuput.epizy.com/fajuxidu.pdfIn PDF document text
    • http://vomifavub.epizy.com/nice_guidelines_fetal_monitoring_during_labour.pdfIn PDF document text
    • http://valamujunitun.epizy.com/89072191680.pdfIn PDF document text
    • https://s3.amazonaws.com/fixararololu/bully_mod_apk_ios.pdfIn PDF document text
    • https://s3.amazonaws.com/votuweroxigezog/the_contemplated_transaction_en_franais.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c682.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC682 5336 bytes
SHA-256: 2d57e63cd6e973a11bda55e06b704958ed4a2a1ccd52cc64d933b9f0b087da56
font_01_sfnt_off0000d891.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD891 10604 bytes
SHA-256: 631670cd47072f4f19ae5709dc03cde6a791ec2d1394fed510ba968bfebf9ca1
font_02_sfnt_off0000fc2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC2B 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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