Malicious PDF — malware analysis report

Static analysis result for SHA-256 450c02b4b19a177f…

MALICIOUS

PDF

76.6 KB Created: 2021-03-23 06:32:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 87a567a6eee13d9e11be963b26d8056f SHA-1: 54ee736184fb8ec6da3bc326a2aa9d7d6c5d04af SHA-256: 450c02b4b19a177f1ee232cfa0b18101c4654c06f9d5309d2814064eaf5b08d1
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious content. It contains a large number of external links, with one pointing to 'https://dafemum.ru/strik?utm_term=wood+finger+joint+router+bit', suggesting a link farm or phishing attempt. The PDF structure also indicates it was generated by wkhtmltopdf, a tool sometimes used to create malicious documents.

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://dafemum.ru/strik?utm_term=wood+finger+joint+router+bit
    • http://kadanijojabuf.mywebcommunity.org/t_fal_actifry_stopped_working.pdf
    • https://cdn-cms.f-static.net/uploads/4490251/normal_601247e612aad.pdf
    • https://static.s123-cdn-static.com/uploads/4453342/normal_5ffdc3488efdd.pdf
    • https://cdn-cms.f-static.net/uploads/4481695/normal_5fd7adbe28658.pdf
    • https://cdn-cms.f-static.net/uploads/4474977/normal_602498bd29360.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fobitomiwoga.epizy.com/wozakademulu.pdf
    • https://uploads.strikinglycdn.com/files/674db954-2678-4309-a241-fb8e045a94a4/97436317116.pdf
    • https://uploads.strikinglycdn.com/files/905da022-a9aa-4c36-bc7a-a85d6c2b7449/80969691120.pdf
    • https://uploads.strikinglycdn.com/files/e13f7c50-3753-402e-a128-3531e1f49fcc/nephilim_giants_in_ohio.pdf
    • https://d12d056d-c16f-42d2-bb36-b12dbd13f8e5.filesusr.com/ugd/a2005d_4290e634d28b4a4f98af01fe416f792f.pdf?index=true
    • https://ac65beef-1c88-4b01-a948-251493ed82f2.filesusr.com/ugd/09857b_f64801cae31545538f2d3af879bae589.pdf?index=true
    • https://88bec3ce-9cdd-4818-a95b-bcf8ac49d1e7.filesusr.com/ugd/72df48_355770c5c512453eb66e595d6146b327.pdf?index=true
    • https://uploads.strikinglycdn.com/files/7c344ab3-8880-4b14-ae3d-b0f08f4c0d5b/15787412014.pdf
    • https://2ea9429b-0332-4ee6-bb75-ab9535b56c99.filesusr.com/ugd/e2f7e1_1ef402041f07413f913db0bf68cbc295.pdf?index=true
    • http://domuromu.atwebpages.com/how_much_does_a_round_bale_of_hay_weigh.pdf
    • http://wunekoxewufomaf.epizy.com/jiwekirufubim.pdf
    • https://c18d9829-3add-4afa-bc87-35007fe3998a.filesusr.com/ugd/70c1ec_54d2e4af6cd449a8a7eb7dafc47c764a.pdf?index=true
    • https://2065f6f1-29fb-48ac-a230-4f4ab2d4b746.filesusr.com/ugd/b62953_4c679c4ab49647d7a5db2e1a4ab2650c.pdf?index=true
    • 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_off0000f0d4.bin
ce795520b5af4bc1186046c9b1f074d3d329c57dffbeac4f2d9bf5a108a8da8c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D4 4884 bytes
font_01_sfnt_off00010197.bin
36e05650b59eacf926b0942359b0cad1ced2ae4d9ec192103f5e807058a54500		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10197 10796 bytes

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