Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a86fa395824ccd2…

MALICIOUS

PDF

70.9 KB Created: 2021-05-27 05:44:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 54335760aa6ce7c3d6c0295ab6012fc2 SHA-1: 58fa3078a437140bc4a3b12a3e8e38ca3ba3d518 SHA-256: 4a86fa395824ccd2f716abf7d6f1fe33c255277b91684d26744e6ff8391e585c
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a link farm, suggesting a phishing or SEO manipulation attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and numerous external URIs point towards a malicious document designed to redirect users to potentially harmful sites.

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://botokaw.ru/strik?utm_term=states+of+matter+test+3rd+grade
    • https://cdn-cms.f-static.net/uploads/4485318/normal_600a8264d3f98.pdf
    • https://dexuruxewiripo.weebly.com/uploads/1/3/2/6/132682754/xepafewunizinajeroza.pdf
    • https://ditezuni.weebly.com/uploads/1/3/5/3/135350757/masimi_jebas.pdf
    • https://cdn-cms.f-static.net/uploads/4476580/normal_5fe816579a15f.pdf
    • https://xopaluwejur.weebly.com/uploads/1/3/1/8/131857284/jopaf.pdf
    • https://cdn-cms.f-static.net/uploads/4464850/normal_6047bb55497de.pdf
    • https://zumofadun.weebly.com/uploads/1/3/4/0/134042547/foroxidonazoxa.pdf
    • https://cdn-cms.f-static.net/uploads/4366022/normal_5fd7f403eac14.pdf
    • https://cdn-cms.f-static.net/uploads/4386081/normal_6028746615b56.pdf
    • https://cdn-cms.f-static.net/uploads/4471969/normal_60355c7957b7d.pdf
    • https://renenanap.weebly.com/uploads/1/3/4/6/134666424/sodegaveboga.pdf
    • https://static.s123-cdn-static.com/uploads/4455198/normal_5fc6683dbb1b1.pdf
    • https://cdn-cms.f-static.net/uploads/4365649/normal_604d2fed90437.pdf
    • https://cdn-cms.f-static.net/uploads/4447434/normal_60163a522eb35.pdf
    • https://static.s123-cdn-static.com/uploads/4465941/normal_60035ad4efb3d.pdf
    • https://rejowuboxobe.weebly.com/uploads/1/3/2/6/132680789/8445289.pdf
    • https://puzuzabijil.weebly.com/uploads/1/3/2/8/132814257/62f207beff72.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/7dca7d2f-37a0-456f-81e8-5fcc55e675ce/4340892617.pdf
    • https://uploads.strikinglycdn.com/files/aa2d350e-cbd3-4534-b283-534459958806/datamax_i_class_label_printer_top_of_form_fault.pdf
    • https://uploads.strikinglycdn.com/files/9a1e5a98-5aa4-42e6-b356-be3c2524aec9/musovuzivu.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_off0000d913.bin
6d8e79544cefd169273c974aea1a64db8c93f39d3a2b66854b42bcc63d5e5cf5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD913 5464 bytes
font_01_sfnt_off0000eb8d.bin
a9e5bc5e99541fdcd523ae5a4ffb42f847483aa23de2cd084b719a6c6281af35		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB8D 10240 bytes

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