Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d523cc2a0ff0c27…

MALICIOUS

PDF

63.6 KB Created: 2021-01-13 14:11:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 5b7ca5b7ab82d6304a048154618ef223 SHA-1: e85705307da50cf48786dc26fbd72744cec624dc SHA-256: 9d523cc2a0ff0c270044a5a7ba2b0155cd6cbbb0d8675dbba393dd144330a141
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, including one pointing to 'trafftec.ru', which is likely used to redirect users to malicious content or phishing sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for link farms, further supporting a malicious intent.

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
  • 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://trafftec.ru/aws?utm_term=microsoft+autoroute+update+free PDF link annotation
    • https://site-1178448.mozfiles.com/files/1178448/ugandan_knuckles_know_da_wae_song.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403681/normal_5fad6e46a2992.pdfIn PDF document text
    • https://site-1190361.mozfiles.com/files/1190361/asuhan_keperawatan_retinoblastoma.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465267/normal_5ffdbc5ccbcff.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408004/normal_5ff9f75d0f1a6.pdfIn PDF document text
    • https://site-1197505.mozfiles.com/files/1197505/poutine_fries_las_vegas.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369764/normal_5fa722e034098.pdfIn PDF document text
    • https://site-1174423.mozfiles.com/files/1174423/bug_battle_simulator_3d_mod_apk.pdfIn PDF document text
    • https://site-1180648.mozfiles.com/files/1180648/negelimesazamajuvo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365562/normal_5fe4aa7316bfb.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/baxegezivumi/16801248054.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_off0000bd37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD37 5120 bytes
SHA-256: df91ee05daf7aa7cf22dfc2016499a9a05c783045a9408e0daedf85ccee2e059
font_01_sfnt_off0000cec0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEC0 10344 bytes
SHA-256: 4aaf263a5cc87dd4e06ea06b91ed90d5f2cfe23e9ad3ad7ef9638ed0bd8e7a33

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