Malicious PDF — malware analysis report

Static analysis result for SHA-256 186acb8067cb0782…

MALICIOUS

PDF

88.0 KB Created: 2021-02-10 15:08:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 6b78c902b3d1f1d470ef62c702a4cb1e SHA-1: 03ad09d11b313b64e88667e9fbf36773ec20720e SHA-256: 186acb8067cb0782117c34a561f511f279fec0ae80e69b809eea5ee8bea44b95
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains multiple embedded links, with at least one identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body, though heavily obfuscated, contains strings related to wkhtmltopdf and dates, suggesting it might be a generated document used as a lure.

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://yafferge.ru/123?utm_term=this+is+gospel+piano In PDF document text
    • http://rezolurumo.iblogger.org/27687847834.pdfIn PDF document text
    • https://cdn.sqhk.co/wolebiduju/ghSBjhc/xesiruxanaxawixuwogezib.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422382/normal_5fdccffd6dd15.pdfIn PDF document text
    • https://cdn.sqhk.co/wedekimelol/igdjcie/digital_video_business_card_maker.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417662/normal_6001f6ef42fd1.pdfIn PDF document text
    • https://cdn.sqhk.co/nolagutotato/gifjghh/68172894989.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bolopanezodubun.rf.gd/commedia_dell_arte_performances_were_based_on.pdfIn PDF document text
    • http://zoratazux.epizy.com/minecraft_1._14_4_cracked.pdfIn PDF document text
    • https://s3.amazonaws.com/jedaxopopuko/pafowa.pdfIn PDF document text
    • http://dokelegusipodi.epizy.com/sokaxawalu.pdfIn PDF document text
    • https://s3.amazonaws.com/jadere/94675863877.pdfIn PDF document text
    • http://zuzekawi.rf.gd/bang_bang_movie_300mb.pdfIn PDF document text
    • http://fabupumow.epizy.com/certificate_format_psd.pdfIn PDF document text
    • http://gewagopixinilu.rf.gd/suwejafomigobex.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_off00011d59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D59 4936 bytes
SHA-256: 139914f727b8ff4dc910495cbd9f02ef546d1577602c7fcd353f6dd26384d77a
font_01_sfnt_off00012e25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E25 10984 bytes
SHA-256: 590cca8fbf15aed4b11956380b9ccf0d39e0961cfef673e36cf138ce9f4ef5f6

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