Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b9831e5c7eeb177…

MALICIOUS

PDF

81.2 KB Created: 2021-03-23 12:19:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 3dc62b88be53266e30d5b796229794dd SHA-1: 24342b0dc3dc4fedd8746d955e9a252319264859 SHA-256: 2b9831e5c7eeb1772d5ec4c1150fc14fa7b970a99949f02782e9f7f3653038f2
126 Risk Score

Malware Insights

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

The PDF contains numerous external URLs, with one specifically identified as a potential lure related to 'the bet short story analysis'. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a large number of links on disposable hosting, suggesting a malicious intent to distribute content or redirect users. ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious classification. No scripts were extracted, but the presence of embedded URLs and the link farm heuristic strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://druttle.ru/strik?utm_term=the+bet+short+story+analysis PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4460460/normal_5fe60d8f58038.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385213/normal_600dc6c69a314.pdfIn PDF document text
    • https://cdn.sqhk.co/fagaxirupunu/iaigigQ/plants_vs_zombies_cheats_infinite_sun_apk.pdfIn PDF document text
    • http://segaruzobuguses.scienceontheweb.net/jenumezi.pdfIn PDF document text
    • http://zisapawiwako.mypressonline.com/ic_cd4013.pdfIn PDF document text
    • http://mapotilij.mygamesonline.org/xabixuxuge.pdfIn PDF document text
    • https://cdn.sqhk.co/temirikuji/newT3Hk/zunixixanuwedevokobibopeb.pdfIn PDF document text
    • https://cdn.sqhk.co/jijatidos/uiebjfl/download_gmod_prop_hunt_indonesia_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/gasalikuviz/rigBlie/informal_crowd_meaning_in_tamil.pdfIn PDF document text
    • https://cdn.sqhk.co/gizapakoni/dJ1hjn1/50918789353.pdfIn PDF document text
    • https://cdn.sqhk.co/liwewajawab/R2N3Tgr/car_parking_multiplayer_free_shopping.pdfIn PDF document text
    • http://tuzotumefakorok.scienceontheweb.net/interesting_facts_about_the_bible.pdfIn PDF document text
    • http://tutafukasit.iblogger.org/11799833029.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc4710bb-d0fe-4ac8-8259-b33740b2af9c/temas_de_historia_que_caem_no_enem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f66c7ed2-3342-463e-8833-98674c2776cb/84428531235.pdfIn PDF document text
    • http://xegiseko.epizy.com/42223797341.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3979558-a5f8-4445-b7d5-a807f5387931/plot_structure_exercises.pdfIn PDF document text
    • http://jezevenakos.myartsonline.com/26743587163.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13279b39-1f61-4b37-89a3-491234575edc/35953694657.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ca5c92a-ff62-4f03-9f48-947dc23d4a86/62856877340.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010262.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10262 4964 bytes
SHA-256: 26e20061ee2260fcfa5c70eb159b6e53d5d4c00134ceb872d7357264e7d3366f
font_01_sfnt_off0001133c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1133C 10704 bytes
SHA-256: 5b0efb01409ca835642c391bf388f1719258f3a575b1add0d34ed6b9763eb855

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