Malicious PDF — malware analysis report

Static analysis result for SHA-256 337d743bb6bd5e42…

MALICIOUS

PDF

73.4 KB Created: 2021-04-29 11:57:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 85ff6fcdf5fa716c0d79f03d27130c79 SHA-1: 502da30eb46cd1e307c9770ae2002c745e010bc9 SHA-256: 337d743bb6bd5e421716a5a50015ffa79756f6993d8b24ec74ce90666c8bae51
126 Risk Score

Malware Insights

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

The PDF file contains an embedded URI that redirects to a suspicious domain, likely for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were extracted, the presence of a malicious URL within the document body suggests an attempt to redirect the user to a harmful site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 5

  • 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 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://botokaw.ru/strik?utm_term=how+to+dunkin+donuts+iced+coffee
    • https://cdn.sqhk.co/mozozezowos/0jjTwBo/xezafatex.pdf
    • https://cdn.sqhk.co/gixelotopa/iibjdjb/download_lagu_big_bang_sedih.pdf
    • https://cdn.sqhk.co/nojedajoze/ieHjdmy/face_masks_amazon_reusable.pdf
    • http://letaraluzim.scienceontheweb.net/70125398836.pdf
    • https://cdn.sqhk.co/fobonelaga/8uAYham/nulajikujekiniwuku.pdf
    • http://zebiripu.mygamesonline.org/child_and_adolescent_development.pdf
    • https://cdn.sqhk.co/mixukavusu/RqigvGN/sakiribasirewokukoziv.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://99b08629-27b2-41dd-83a1-938dc2ca35bd.filesusr.com/ugd/067ecb_4f58f3677d0743b3b0c628fe765d4870.pdf?index=true
    • https://uploads.strikinglycdn.com/files/52b913c9-8b83-4804-943a-b4cde1127625/bosch_super_silence_plus_42_dba_manual.pdf
    • http://dapufojutujat.atwebpages.com/xetuzumabesozuwixujix.pdf
    • https://ba789de2-c385-43ee-b32d-a34c698d1993.filesusr.com/ugd/b7082a_ab70f6c85a1b4b73aae2e6476cfd6d9f.pdf?index=true
    • https://uploads.strikinglycdn.com/files/16595afd-c22d-472a-8bc5-16f0735ad2c4/35958163551.pdf
    • https://s3.amazonaws.com/rupatojuko/16823341808.pdf
    • https://4e33067b-0f13-4bed-bb9c-ea95f768fd7c.filesusr.com/ugd/23924c_9c35a40d79e349efbbe75bc3d2e9026b.pdf?index=true
    • https://78fa80b2-8629-447b-ad63-53e91e8d4948.filesusr.com/ugd/8f02de_2477251a315b4747a5d7e16520ce9325.pdf?index=true
    • https://s3.amazonaws.com/rewepalazamiso/85698021707.pdf
    • http://xogijowag.onlinewebshop.net/wiwigibepugufad.pdf
    • https://uploads.strikinglycdn.com/files/b8479254-f2a5-4139-b5bc-58dae7fffd9b/sibelius_shortcut_keys.pdf
    • https://d75bbb92-b0e4-4b50-83e6-2443e695523b.filesusr.com/ugd/bc73b9_7199a93cc0b741fd9dafbfa7557c13c8.pdf?index=true
    • http://dokudaruriwiv.atwebpages.com/income_affidavit_format.pdf
    • https://s3.amazonaws.com/kovezodepugov/fuwumavoremuwuwizaxidibo.pdf
    • https://uploads.strikinglycdn.com/files/b65d9111-550d-4db1-bdf9-5eec6a9232f5/thomas_troward_quotes.pdf
    • https://s3.amazonaws.com/pokorevalaxex/27856039162.pdf
    • https://uploads.strikinglycdn.com/files/4dbd7b9e-4765-49de-8d56-de429d43ac96/25702524208.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_off0000e001.bin
5236f3706b5f01bdf35ed9a673367bd4c0bcd9868ae0297fe24e67068b7774ba		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE001 4796 bytes
font_01_sfnt_off0000f081.bin
f7f649c2be2604eba38620915b1a1502658ddc2241aa0b21596ea7036724f1af		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF081 11240 bytes

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