Malicious PDF — malware analysis report

Static analysis result for SHA-256 9503ddfa8fcb4453…

MALICIOUS

PDF

70.2 KB Created: 2021-06-02 00:33:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5a7ac87d3796cd31a9ff9d151a2660f6 SHA-1: 481806d03831d8832d53269a4622ce4fee79d890 SHA-256: 9503ddfa8fcb4453baa59f9ce9bf43506fcd1cdc7858cc7b120a870506699796
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical detection for a link farm and a high ML score. It contains numerous external URIs, with a primary focus on `https://dugedepap.ru/123?utm_term=april+2017+sat+answers+college+board` and a large number of Weebly-hosted PDF links, suggesting an attempt to manipulate search engine results or redirect users to malicious content. No scripts were extracted, but the PDF structure itself is used to host these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://dugedepap.ru/123?utm_term=april+2017+sat+answers+college+board
    • https://puroporutenes.weebly.com/uploads/1/3/1/6/131606954/7035045.pdf
    • https://static.s123-cdn-static.com/uploads/4374853/normal_5fc8c09b8968d.pdf
    • https://cdn-cms.f-static.net/uploads/4368229/normal_604318272b25c.pdf
    • https://tikigafose.weebly.com/uploads/1/3/0/8/130874564/jawipatub.pdf
    • https://rigawolazi.weebly.com/uploads/1/3/4/7/134710531/3567986.pdf
    • https://pavaliwakugaban.weebly.com/uploads/1/3/4/3/134373235/298b2d.pdf
    • https://static.s123-cdn-static.com/uploads/4386849/normal_60059f485a5e2.pdf
    • https://zegepefuloruwan.weebly.com/uploads/1/3/4/0/134012378/6dc9f88b265.pdf
    • https://mofumamivuzav.weebly.com/uploads/1/3/1/0/131070192/guxabiwebuzawojozati.pdf
    • https://static.s123-cdn-static.com/uploads/4385012/normal_5fef17f5d42b7.pdf
    • https://wefakibulebu.weebly.com/uploads/1/3/1/4/131408371/48871eafcd1.pdf
    • https://jijiluvupetopib.weebly.com/uploads/1/3/4/6/134644839/1245496.pdf
    • https://static.s123-cdn-static.com/uploads/4489588/normal_5febf6b0d84ab.pdf
    • https://cdn-cms.f-static.net/uploads/4414869/normal_5fd5f6b63c9ea.pdf
    • https://static.s123-cdn-static.com/uploads/4365657/normal_5ff1ecb8dc745.pdf
    • https://maduzoxunixeg.weebly.com/uploads/1/3/0/7/130775653/sogudobowifonix-buledotigavevo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/d21ff2cf-2d00-4651-96ab-f64780544691/cs_go_freezes_randomly_2021.pdf
    • https://uploads.strikinglycdn.com/files/8fed7747-a726-4d2e-9703-031d64adc626/what_are_the_4_types_of_journalism.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf0f.bin
cfa30fd8197a8a07f205c8954acf3f5c7fe24214681f237fc18b2c280bb69a20		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCF0F 5868 bytes
font_01_sfnt_off0000e32e.bin
4e8fc9d8b6066ddf4e39cd9254868b1722ce9ca273d617f9d574ebd11955a353		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE32E 11340 bytes

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