Malicious PDF — malware analysis report

Static analysis result for SHA-256 f743e87befd18754…

MALICIOUS

PDF

85.0 KB Created: 2021-03-23 23:09:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 06ba9bbbd18f49267af0baddf7fd061e SHA-1: e6b77c8384b5a5a84802facab19d0842b45cd686 SHA-256: f743e87befd18754c1da8f4a16ec5c28412221cfa740b3cb65fcf69b1a7030d8
156 Risk Score

Malware Insights

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

The PDF contains a link farm and an external URI pointing to 'dafemum.ru', which is suspicious. The ML classifier and ClamAV detection strongly indicate maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to potentially malicious websites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • 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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://dafemum.ru/wix?keyword=dyson+manual+sv03
    • https://cdn-cms.f-static.net/uploads/4408866/normal_605a0dda6f027.pdf
    • https://static.s123-cdn-static.com/uploads/4497095/normal_5feb48b3dfb18.pdf
    • https://cdn-cms.f-static.net/uploads/4416132/normal_5fd87931ad935.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/a54321e7-d680-4b28-8e15-985843a10472/61924124335.pdf
    • https://s3.amazonaws.com/lukepepe/how_many_questions_on_the_social_studies_ged_test.pdf
    • https://s3.amazonaws.com/zebarufuridorur/dinet.pdf
    • https://s3.amazonaws.com/bovenotojitowe/xaxumosa.pdf
    • https://uploads.strikinglycdn.com/files/0a30b2bb-4a72-429f-948c-83629556e26b/kaxokupenumatatojuduju.pdf
    • https://s3.amazonaws.com/godoremitiwuja/malufupi.pdf
    • https://s3.amazonaws.com/kawotexulozax/48791664998.pdf
    • https://uploads.strikinglycdn.com/files/58ab59b9-3cdb-4305-a6bc-db6b175ca913/64621914287.pdf
    • https://s3.amazonaws.com/sojenozap/metabolisme_lemak.pdf
    • https://uploads.strikinglycdn.com/files/173a29f4-dcda-410b-a7ac-b88c5f83f135/sc_dmv_locations_open_on_saturday.pdf
    • https://s3.amazonaws.com/mekonulegipero/wefisev.pdf
    • https://486bfeb6-87d8-40a3-812f-3449909c9139.filesusr.com/ugd/81b904_b9d722f4f0d6440c94a24ff72a876dc6.pdf?index=true
    • https://s3.amazonaws.com/kozibowisenatu/appium_desktop_for_windows_32_bit.pdf
    • https://s3.amazonaws.com/jupoti/vufidetewelur.pdf
    • https://s3.amazonaws.com/sitozi/mofikafun.pdf
    • https://s3.amazonaws.com/punagilelabon/alien_shooter_2_apk_full_version.pdf
    • https://s3.amazonaws.com/bomupi/74959077325.pdf
    • https://5e024257-ca51-40df-b6b5-a3104c7b7124.filesusr.com/ugd/97368a_a32cf89e92914c2087f9e2aaf6dd178e.pdf?index=true
    • https://uploads.strikinglycdn.com/files/1b5707d8-a91b-4069-b7fc-393214d3b6f4/denuxodonupugib.pdf
    • https://s3.amazonaws.com/purixifusipelid/adobe_photoshop_elements_2018_free.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001041b.bin
d61fdb041fa9b650078d7714ae3dfa37ed81abe73164811f796b9bc684b9966b
pdf-font-stream PDF embedded font (sfnt) at offset 0x1041B 4840 bytes
font_01_sfnt_off0001146f.bin
1b759daea8c03839582d08bab52e5e245546330e0353397a43fe748825aa14fa
pdf-font-stream PDF embedded font (sfnt) at offset 0x1146F 10516 bytes
font_02_sfnt_off0001388c.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2
pdf-font-stream PDF embedded font (sfnt) at offset 0x1388C 4324 bytes