Malicious PDF — malware analysis report

Static analysis result for SHA-256 4159fa00d90bfa26…

MALICIOUS

PDF

73.8 KB Created: 2021-04-20 01:46:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 92aaf2694703317accf5ec2bfc03416c SHA-1: 56645d3c3938cb95a0e0960a150262f17e061215 SHA-256: 4159fa00d90bfa262815774e8f2bb2ec68817a27a5860b51952332933d3c40f5
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, identified as a link farm, with one prominent URL pointing to a suspicious domain. ClamAV and ML classifiers flagged this PDF as malicious, indicating a phishing or malware distribution attempt. While no scripts were explicitly extracted, the PDF structure and extensive external links suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://soxebez.ru/strik?utm_term=angelcare+mini+bath+support+grey PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4384831/normal_604f12232217f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476427/normal_600fe397dc30d.pdfIn PDF document text
    • https://cdn.sqhk.co/fapolokid/c8iftXk/1192994216.pdfIn PDF document text
    • http://ladebizelase.scienceontheweb.net/al_quran_dan_terjemahan_bahasa_melayu.pdfIn PDF document text
    • http://rijexofugovu.medianewsonline.com/eleven_rack_expansion_pack.pdfIn PDF document text
    • http://wopizup.mypressonline.com/wodutametoxofegovibeke.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408335/normal_6055659826ebe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489440/normal_606bcb740e0f9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417313/normal_6063da1c28cc3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408471/normal_6051cace18db6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496815/normal_6027c3392684e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469834/normal_601dd62147d0b.pdfIn PDF document text
    • https://cdn.sqhk.co/luzeginu/aYhaHUV/74329470210.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f9cb7010-568c-45d0-b0a5-7bd630b60272.filesusr.com/ugd/b10ea2_e2f21cf2b96d449f866f10ae93732f16.pdf?index=trueIn PDF document text
    • https://6b54b0b2-91db-43cc-88c8-bbc4f7e20b37.filesusr.com/ugd/a773aa_adb7c47f21be47d096d3ee47c14386a3.pdf?index=trueIn PDF document text
    • http://miganuvag.myartsonline.com/modojid.pdfIn PDF document text
    • https://s3.amazonaws.com/remufuzu/gadubata.pdfIn PDF document text
    • https://s3.amazonaws.com/tugabijenovili/49237286641.pdfIn PDF document text
    • https://53860ffb-5975-4088-b838-5c82367c2827.filesusr.com/ugd/0d2908_8843253281184b43a038fbdb6fd47640.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gajabedafot/how_long_do_you_cook_venison_jerky_in_a_dehydrator.pdfIn PDF document text
    • https://30f21d72-2b41-4965-a7bc-2abb02bf1ded.filesusr.com/ugd/47e66e_b608e2908ad24d6abf11b3eb60e0f2fb.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/ganubatebedoxez/51286443660.pdfIn PDF document text
    • https://34ec465e-51aa-4dba-9a8c-c05fcfb5ae84.filesusr.com/ugd/df15ee_dde86aa8d1fe45d3ada53ab6fa325389.pdf?index=trueIn 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_off0000e0a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A5 5576 bytes
SHA-256: 05ced83fc4539db3fc7eeb7af99b292422017ad7a440693c8d9407b383b29158
font_01_sfnt_off0000f37c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF37C 11212 bytes
SHA-256: f831f1c7331b7806823c316c2db4b1454c87ec6da1af36b6bf81bb71886d6213