Malicious PDF — malware analysis report

Static analysis result for SHA-256 748d881c339c8f48…

MALICIOUS

PDF

101.1 KB Created: 2021-03-08 06:14:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 4f5e2f4bbebe0114c6609c8418692bc2 SHA-1: 5d05c3deaea9a1406e44173de3a27ad1751fe1a9 SHA-256: 748d881c339c8f4850b9a749149992d00f21af832b3df12d5b9b2db51fe7a1e4
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The presence of external URIs and a link farm heuristic points towards an attempt to direct users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://xezojetit.ru/strik?utm_term=how+do+i+use+my+rival+roaster+oven PDF link annotation
    • http://alteramaks.world/agent_tds_report_in_finacleg8l83.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365620/normal_6040360f76a31.pdfIn PDF document text
    • http://carbags.site/dragon_ball_z_shin_budokai_2_mod_ppsspp_free_downloado6w9b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421210/normal_5fc676c95295e.pdfIn PDF document text
    • http://ledimpress.biz/barataria_north_secondary_school_uniformtr2sg.pdfIn PDF document text
    • http://baby-slings.ru/is_net_income_income_after_taxesl7e7b.pdfIn PDF document text
    • http://bella24.xyz/nitiwovudakofasikjfkw0.pdfIn PDF document text
    • http://jixelaxoli.66ghz.com/vivah_full_movie_hd_300mb.pdfIn PDF document text
    • http://kijorifoweb.22web.org/36386955498.pdfIn PDF document text
    • http://pinudub.iblogger.org/apartment_lease_contract_form.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/44b69adf-edf5-4b27-ad58-bc087983e99e/gukojiwaviwofapebedeko.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce0049ad-d362-4d8a-a755-3a6ae7324e6c/what_is_the_best_diet_for_brain_health.pdfIn PDF document text
    • https://61069a5e-3c5f-4884-a3c7-8c7552058b74.filesusr.com/ugd/0789d5_eef84f6efe694649bb6baf3ba8aafd57.pdf?index=trueIn PDF document text
    • http://sopexas.epizy.com/60174682943.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b04d38c-0d63-4285-a626-51f110a8dd0b/57578708780.pdfIn PDF document text
    • https://d0bf7e8b-5449-41c0-93e9-161603c0719f.filesusr.com/ugd/197ed4_830d4e00410e4e19ae4330596cb0133c.pdf?index=trueIn PDF document text
    • http://melewurimepuja.rf.gd/85137061889.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ec7a86a-36c9-4f3f-8cb3-64833645d6f9/77887267219.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/276e4909-19fc-4703-9e5d-38cc2d0a9aaa/how_to_improve_hand_flexibility_for_guitar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ecbdcfc8-8135-4a53-9511-ae9d13432c88/kudidav.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eee96ca0-85d4-49cb-8b45-31876b6ee9fe/laletewefiruxa.pdfIn PDF document text
    • https://1a9cd40a-f0d6-44d4-a143-19288280ca2b.filesusr.com/ugd/7a13df_deddc99e7ba041a6a158b68bcf9168d4.pdf?index=trueIn PDF document text
    • https://3682d434-6e27-4ac8-9ac2-d3ec24fa429c.filesusr.com/ugd/9b5f63_ae89d4480e274355b22d9e9ffbe2adb4.pdf?index=trueIn PDF document text
    • https://f8071fb1-33dc-4bb9-9fe9-292e0ca0d861.filesusr.com/ugd/253000_ce02dfad235b480195026d631b18e858.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_off00014d5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D5D 5184 bytes
SHA-256: 456db272786fc6e148ed99a7a4d45dc97347f205a817a8d19b44a51a8a60c72d
font_01_sfnt_off00015efd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15EFD 11768 bytes
SHA-256: 0a32dc1be228ca37cef387073918206707a47e9b81d2d7006b15113c706b39ca