Malicious PDF — malware analysis report

Static analysis result for SHA-256 6391b799ece79b5a…

MALICIOUS

PDF

77.7 KB Created: 2021-03-23 01:30:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: e6b6aed7195567d7384a8fdf5cdf80c2 SHA-1: 59943717a2d1ed1a0be15c338d2fcc905c9b2bfa SHA-256: 6391b799ece79b5aae82c893e846abdc465fa1ee191ab289145d80a01bfd5ffe
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing campaign. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicate this malicious intent. The ML classifier and ClamAV detection further confirm the malicious nature of the file, classifying it as a phishing trojan.

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://xezojetit.ru/wix?keyword=lucky+numbers+dream+guide+pdf PDF link annotation
    • https://cdn.sqhk.co/jozojijejip/BDjfge8/wallpaper_engine_zombie_gif.pdfIn PDF document text
    • http://zesegalos.scienceontheweb.net/crochet_for_beginners_book.pdfIn PDF document text
    • https://cdn.sqhk.co/kelanadu/gjjJhai/16354007243.pdfIn PDF document text
    • https://cdn.sqhk.co/metexemoraga/aVLSo17/game_of_thrones_final_king.pdfIn PDF document text
    • http://larebalin.mypressonline.com/tizuvopojedukinenujimox.pdfIn PDF document text
    • https://cdn.sqhk.co/rojawamusula/hgAf0Uo/the_university_of_hong_kong_master_of_finance.pdfIn PDF document text
    • https://cdn.sqhk.co/fasisela/zijdjCd/65423761117.pdfIn PDF document text
    • https://cdn.sqhk.co/kokademesuz/fhd2hef/smilodon_rampage_2_y8.pdfIn PDF document text
    • http://tonevagewalilu.medianewsonline.com/condense_mac.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/novifamigot/are_harbor_breeze_light_kits_universal.pdfIn PDF document text
    • https://6eed613e-cbae-405e-b458-9655ef9033f8.filesusr.com/ugd/e4f6f0_fdbc5b9faafa4cafbdb0cd281fe96dd8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wokesabisevo/50019809404.pdfIn PDF document text
    • https://6d23287f-a15b-43b7-8d69-700c0e01f504.filesusr.com/ugd/185c00_852b53f6ea7a454f9f75987fa4298471.pdf?index=trueIn PDF document text
    • http://lewinozed.atwebpages.com/zazujowusal.pdfIn PDF document text
    • https://s3.amazonaws.com/xijilesuzuxo/book_of_pook_summary.pdfIn PDF document text
    • https://s3.amazonaws.com/jofunozuzof/100_cotton_sheet_sets_king_size.pdfIn PDF document text
    • https://s3.amazonaws.com/ximupuv/1910_High_Germany_Road_Warfordsburg_PA.pdfIn PDF document text
    • https://s3.amazonaws.com/jagux/olx._ba_apk.pdfIn PDF document text
    • https://93dbb2ad-f1e8-4c6c-adfd-2ef134399473.filesusr.com/ugd/df4650_9c4b60b741a14ea0a309af46cf070cd0.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_off0000f179.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF179 5692 bytes
SHA-256: 87377cf4d023e08142412d94eca0ad47d7e2dbd4c26634ac76ae78a432629ee6
font_01_sfnt_off000104d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104D6 10808 bytes
SHA-256: a6dc1f6346df45349942f67802ce5e6f57470face94f1be508755c988486040c

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