Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ec2c44540bcfb26…

MALICIOUS

PDF

97.5 KB Created: 2021-03-11 21:46:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: b54b03c3938ab6081b99937c56fed39c SHA-1: fd2d945bfb06ad3b196488fef1606a36fd3fdb63 SHA-256: 8ec2c44540bcfb26bbfec0541137cc3d07b10c7d6df3add62d1b5d704036bbaa
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicative of a link farm or SEO spam campaign. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The embedded URL and the document body's reference to a popular router model suggest a lure to attract clicks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://zajinet.ru/strik?utm_term=does+asus+rt-ac88u+support+aimesh PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4476281/normal_603041765eb7d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4499972/normal_5ff1bfdadc96c.pdfIn PDF document text
    • https://cdn.sqhk.co/fuluzezufe/rtMjjic/architects_salary_guide_2018.pdfIn PDF document text
    • http://shop-onlinediscount.xyz/da_form_2166-_9-_2w1vb8.pdfIn PDF document text
    • http://juilopkiretlo.ru/59095984959o1c8t.pdfIn PDF document text
    • http://kudretbozaci.com/airbrush_magazine_free_downloadj6tar.pdfIn PDF document text
    • http://kigaruzolalo.mypressonline.com/pasos_para_intervenir_en_crisis.pdfIn PDF document text
    • http://mevakimuvu.mypressonline.com/mokesi.pdfIn PDF document text
    • http://egosikenclub.com/luxupogfqu7.pdfIn PDF document text
    • https://cdn.sqhk.co/didowolikex/e7hViQt/futopitomarudu.pdfIn PDF document text
    • http://hurricane1.space/f1_2016_game_system_requirements3z7kr.pdfIn PDF document text
    • https://cdn.sqhk.co/ridasozewe/jjgE0gf/rugby_world_cup_2019_bracket.pdfIn PDF document text
    • https://cdn.sqhk.co/goluxewimabu/Rjdgcif/zilemiwegozumisarejojo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://878ee1be-828d-48b9-a24a-84283cf66a1c.filesusr.com/ugd/86936c_eacb096a1eb24d45ab359eb97c8f9081.pdf?index=trueIn PDF document text
    • https://87164119-88a6-4d6d-a72f-b109cf2d88b9.filesusr.com/ugd/bd0a66_d60750932e1040f08bab44502d006fc3.pdf?index=trueIn PDF document text
    • https://60f6da8c-824c-4163-aae9-6195f2ac7ed4.filesusr.com/ugd/7f16bd_e3cbd0dd23d046d0a542220085418504.pdf?index=trueIn PDF document text
    • https://c2267750-1f6d-4c2f-944a-eb302c7f07d7.filesusr.com/ugd/93971e_8c5392b072494932a454e0b5e2b6fef1.pdf?index=trueIn PDF document text
    • https://73e25548-3913-4bbb-aa69-a1b25f69568d.filesusr.com/ugd/cece23_7ef8ca220fad4b529bbdd56be6701e7c.pdf?index=trueIn PDF document text
    • https://484a0fbd-04e0-416f-b335-41eb3f66808b.filesusr.com/ugd/228afb_0ac52c1d6b504fdc848f1b04aa62b8c6.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_off0001403a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1403A 5364 bytes
SHA-256: d5cf50d53783ad1dcf5efe00131686050947a7c2aaa7fc4d358e4555c04bd716
font_01_sfnt_off0001525d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1525D 11328 bytes
SHA-256: 39c1fd673e82d78f23f2aa8892cdc3488ca506163d6a57e31a2e0f1dcf5704ad

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