Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b24ac2e7df4b9e4…

MALICIOUS

PDF

77.3 KB Created: 2021-02-15 12:01:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: f8bf3481c4d36f34a6572258a0a420ae SHA-1: 351112185060d1ab8449661f92e55b67bbbfb5e5 SHA-256: 5b24ac2e7df4b9e4ab40b592c7d7628d0969a5f45de2a5a08374381e8830ee65
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and an ML classifier, with ClamAV detecting it as Pdf.Phishing.Trojan. The file contains a large number of external links, indicating it functions as a link farm designed to redirect users to potentially malicious content. The document body's reference to 'Wendy's nutrition calculator carbs' suggests a lure to disguise the malicious intent.

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://baarspo.ru/123?utm_term=wendy%2527s+nutrition+calculator+carbs PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4403130/normal_5fda961557a0e.pdfIn PDF document text
    • https://rinulokol.weebly.com/uploads/1/3/4/8/134868038/c8ac8200534087.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383692/normal_5fd0983e70379.pdfIn PDF document text
    • https://gemexufata.weebly.com/uploads/1/3/0/7/130739895/9410873.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380382/normal_600aa5915b151.pdfIn PDF document text
    • https://mesasijodise.weebly.com/uploads/1/3/5/3/135315214/kesisarofexu.pdfIn PDF document text
    • https://totijavefukaja.weebly.com/uploads/1/3/4/7/134705726/zizeruwudobiwoj.pdfIn PDF document text
    • http://wopebexe.66ghz.com/card_view_animation_android_example.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459645/normal_6001dbe13b844.pdfIn PDF document text
    • https://mototide.weebly.com/uploads/1/3/2/7/132710683/zejukefi_mesexabinawidar_zotikugo_fuwusefimose.pdfIn PDF document text
    • https://nebunabimumebu.weebly.com/uploads/1/3/4/4/134480995/simenonor-pizosemuzami.pdfIn PDF document text
    • https://zubosevofugojat.weebly.com/uploads/1/3/4/3/134307347/gidogusabi-gugiruvufek-sakezetogoba.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://luwemazezabubat.rf.gd/krups_1020_espresso_machine_manual.pdfIn PDF document text
    • http://xawoforusur.epizy.com/alvida_song_metro.pdfIn PDF document text
    • http://wekolaxoretewov.epizy.com/zolujakabelad.pdfIn PDF document text
    • http://kulitetokap.epizy.com/tenis_plataforma_beira_rio_conforto.pdfIn PDF document text
    • http://fakipewoze.rf.gd/jamaica_agricultural_marketing_information_system.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_off0000f20c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF20C 5220 bytes
SHA-256: bc2a4d8fb769b844c00c521fd14976c7835659862fe1a2213dbff9d3aa7a319b
font_01_sfnt_off000103f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103F3 10520 bytes
SHA-256: ac6127428ad5375478fd7d7c532ec027dfe3c9e16bf5cd9d60a952b711bcaa6d

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