Malicious PDF — malware analysis report

Static analysis result for SHA-256 80c10e3dbbfdff46…

MALICIOUS

PDF

80.7 KB Created: 2021-02-27 00:24:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 7b28080dfec907baebbc48d551b516e4 SHA-1: aac93a3a8e6f7b04606d50fc9bd2fd4a495a0f82 SHA-256: 80c10e3dbbfdff465e3941b8eebe62d91b88f1177f76a909a7956f7504fac431
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 designed to distribute traffic or host malicious content. The primary URL, 'https://mezovuduw.ru/award?keyword=how+much+should+i+invest+as+a+beginner', is presented in a way that mimics a search result, likely to trick users into clicking. ClamAV and ML classifiers also identified this file as malicious, specifically 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://mezovuduw.ru/award?keyword=how+much+should+i+invest+as+a+beginner PDF link annotation
    • https://cdn.sqhk.co/kunimanujage/ZYhihhY/king_of_hell_manga_romance.pdfIn PDF document text
    • https://cdn.sqhk.co/nububufi/f7UxMja/81128903875.pdfIn PDF document text
    • https://fofumizuzel.weebly.com/uploads/1/3/2/7/132740209/wexekusikez.pdfIn PDF document text
    • https://zilonuxe.weebly.com/uploads/1/3/1/6/131637529/nokegufuroxisi.pdfIn PDF document text
    • https://bovatukal.weebly.com/uploads/1/3/0/7/130739183/gokesutozokijer.pdfIn PDF document text
    • https://cdn.sqhk.co/tefozakozup/hcic9gh/80s_karaoke_songs_with_lyrics.pdfIn PDF document text
    • http://virnet77.ru/robonoregademijamumin4he2o.pdfIn PDF document text
    • https://cdn.sqhk.co/safubuguva/ahijcjf/halloween_colored_contacts_cheap_non_prescription.pdfIn PDF document text
    • https://xefobizedep.weebly.com/uploads/1/3/1/6/131636625/zixabuvajapidodexabo.pdfIn PDF document text
    • https://cdn.sqhk.co/minederepa/eZhhqST/57139948159.pdfIn PDF document text
    • https://cdn.sqhk.co/gofuzurafano/jQNkQOW/rally_house_kansas_city_chiefs_hat.pdfIn PDF document text
    • https://pofemazavuson.weebly.com/uploads/1/3/2/3/132303373/bojovirakiba.pdfIn PDF document text
    • https://cdn.sqhk.co/mogilirexexa/hjhcjib/firizojawadulodef.pdfIn PDF document text
    • http://g2am2e.xyz/ejercicios_ley_de_ohm_con_soluciones2up5m.pdfIn PDF document text
    • https://cdn.sqhk.co/kiwikiza/sfvUshf/beetles._io_popular_io_game.pdfIn PDF document text
    • https://redelonoxoti.weebly.com/uploads/1/3/1/6/131606094/rumitojunoxas-benim-mekepefa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/xeponodij/wegadad.pdfIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f109.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF109 5488 bytes
SHA-256: 4de15cf75274cd76f9a14da2af44438a7a86a981e04e86caad9b97b1b0afe7bf
font_01_sfnt_off00010399.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10399 10528 bytes
SHA-256: 72e2acd03c0e9fb8d4dbd591a18fc51426f0f7a26bbcac1f2e651949fde25caa
font_02_sfnt_off00012796.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12796 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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