Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed4448b57d3a0ddb…

MALICIOUS

PDF

78.6 KB Created: 2021-05-12 06:36:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 22ee5c70859af3ca2ea2e0a148837e10 SHA-1: e34e1daee799697b442ca38a981cffc9e4888a85 SHA-256: ed4448b57d3a0ddb27f89d66c4cd27254201cecb6f59d6b1fac9859f689d377a
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, suggesting a link farm or phishing attempt. The embedded document body text, though corrupted, includes a search query that aligns with the observed URLs. The ClamAV detection and ML classifier further indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jumiwimov.ru/strik?utm_term=what+does+the+word+mean+greenlight
    • https://cdn.sqhk.co/xujuvotu/jAPibhj/biruwokofewi.pdf
    • https://menuvinowit.weebly.com/uploads/1/3/5/3/135320060/zofolesuxozabab.pdf
    • https://cdn.sqhk.co/nosimasiv/UitWxgf/tisezibipoponosizegavo.pdf
    • http://jofifuneku.medianewsonline.com/damiwaturikurekurowe.pdf
    • https://wobipogipexiwom.weebly.com/uploads/1/3/1/0/131070125/kexazorejanakuzoxoti.pdf
    • https://cdn.sqhk.co/jadojibam/dZiiFgh/43117035599.pdf
    • https://cdn.sqhk.co/mosepoxik/Tg4ajeh/las_vegas_slot_tournaments_2019.pdf
    • http://dakekunagefasak.sportsontheweb.net/46183381286.pdf
    • http://finipupote.mywebcommunity.org/pazov.pdf
    • https://rediwikutine.weebly.com/uploads/1/3/4/0/134096605/kabefe-kalax.pdf
    • https://xetutimi.weebly.com/uploads/1/3/0/9/130968997/230ac.pdf
    • http://xopaberowiwin.getenjoyment.net/calculus_8th_edition_answers.pdf
    • http://sopizubivivelam.iblogger.org/instagram_app_free_apk_for_pc.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://5e3b32e6-a537-4a58-a531-ef303a468713.filesusr.com/ugd/120874_b3b82e1fb92e43a4aff0ab345d711459.pdf?index=true
    • http://pejonoma.epizy.com/boxapanulixakanus.pdf
    • https://ac734925-007a-49fa-9a6b-2340142042ec.filesusr.com/ugd/ea78e0_ee5ab878f3b94b9485f063bea5bffaf4.pdf?index=true
    • http://tazolupiviroliz.epizy.com/paxize.pdf
    • https://0ccb9a81-bd3c-41bd-bc79-2352350f0e5e.filesusr.com/ugd/95ea6b_9b4713075b784db49479983f7a843e46.pdf?index=true
    • https://0c7b1e5d-10e9-4c66-9a64-57e6babc74f3.filesusr.com/ugd/6b59ba_693b046ffba54d8a88ebc714862f33e9.pdf?index=true
    • https://eb72eaa1-ef55-40a3-a653-f6d21bccf295.filesusr.com/ugd/54913d_19c9f910ba9c4f7491784bdd1791358b.pdf?index=true
    • http://nabasuxogakuwet.epizy.com/joxozovopavutuduve.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_off0000f49a.bin
0b8e4bff37f9be50c2cb71ad37e20d26ccab4509b63061b4379a424cf120bc7f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF49A 5344 bytes
font_01_sfnt_off000106b2.bin
8c68b51b8ac344776b7724a938f9affa105c0921ead0bce63f5a01264a3e500a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x106B2 10860 bytes

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