Malicious PDF — malware analysis report

Static analysis result for SHA-256 f92c0245501b88e1…

MALICIOUS

PDF

110.9 KB Created: 2021-02-24 19:35:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: c6789087c7b41f1af2c6e73e2a329d46 SHA-1: d6db82f8afb39e81e8320e8d2e1fd591eab00e61 SHA-256: f92c0245501b88e14fa6e949e260a691f8c37fe716827a9b104f1684e0ddb2be
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URIs are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://druttle.ru/123?utm_term=supernatural+castiel+episodes PDF link annotation
    • https://sojetupeduxagi.weebly.com/uploads/1/3/1/8/131856567/6727078.pdfIn PDF document text
    • https://cdn.sqhk.co/turaxulefa/jHfzBVu/ice_audio_wizard_asus_download_windows_10.pdfIn PDF document text
    • https://moxetutatag.weebly.com/uploads/1/3/4/2/134234950/bonololirovil.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383568/normal_6017c1a26b570.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416132/normal_5fcdf42f4d68c.pdfIn PDF document text
    • http://jofised.iblogger.org/report_reckless_driving_nc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375350/normal_5fea40c9cc7f6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465257/normal_5fce167f2a2d8.pdfIn PDF document text
    • http://juwupexutaval.mywebcommunity.org/how_to_replace_ear_pads_on_beats_studio_2.0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445550/normal_602467b2b7638.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390659/normal_60220e3226333.pdfIn PDF document text
    • https://tamidotojo.weebly.com/uploads/1/3/1/8/131858916/879c31636.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372087/normal_600dbfa971861.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gozenabuzixi.onlinewebshop.net/90668541666.pdfIn PDF document text
    • http://zivobojunoloma.epizy.com/fekefuwukutugotobisu.pdfIn PDF document text
    • http://vubelifijam.atwebpages.com/57413766852.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_off000176de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x176DE 5168 bytes
SHA-256: 8c1f763704baea885448c4696a9afc0f772ed17a1f89859895cb7118d480d48e
font_01_sfnt_off00018876.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18876 11208 bytes
SHA-256: 34e10604fb1bf046a91b410dd6fcbdcfdc5e6ca523280bc6f0decf7ea50ab453

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