Malicious PDF — malware analysis report

Static analysis result for SHA-256 492773a831a378fa…

MALICIOUS

PDF

90.1 KB Created: 2021-03-09 03:48:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: e82763f20e1d22cb2c63b61cbc984743 SHA-1: ed7727272c7f3bc425e6daab6d43a9cfbd6a12e0 SHA-256: 492773a831a378fabbae2d44ecb4184a259c454206584e16c0b3310fd6a26e44
186 Risk Score

Malware Insights

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

This PDF document was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains a large number of external links, many pointing to disposable domains, suggesting it functions as a link farm designed to redirect users to malicious sites. The document body text, while appearing innocuous, is likely a lure to encourage clicks on these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://ponafet.ru/strik?utm_term=can+you+make+a+wine+cooler+colder PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4486199/normal_601b354baad9e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409619/normal_6046b09d9830e.pdfIn PDF document text
    • https://febamepu.weebly.com/uploads/1/3/1/0/131070604/fexuzopazomo.pdfIn PDF document text
    • https://letosuve.weebly.com/uploads/1/3/0/7/130739520/pupow.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366011/normal_6012dfd4a03bf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492600/normal_602c5ae25bf40.pdfIn PDF document text
    • http://bewewafip.scienceontheweb.net/yates_and_goodman_probability_and_stochastic_processes_3rd_edition_solution_manual.pdfIn PDF document text
    • https://xikewewojan.weebly.com/uploads/1/3/4/0/134095915/pojakug.pdfIn PDF document text
    • http://juwupexutaval.mywebcommunity.org/65836228906.pdfIn PDF document text
    • https://zekenegelu.weebly.com/uploads/1/3/4/3/134390475/3096193.pdfIn PDF document text
    • https://cdn.sqhk.co/naxupowu/Wej5Ogi/candy_crush_friends_saga_download_apkpure.pdfIn PDF document text
    • https://cdn.sqhk.co/wewuxujudu/hjDUiaR/sofakiwuruwufijufomet.pdfIn PDF document text
    • http://vogudikomi.getenjoyment.net/what_influences_ethics.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420761/normal_602c6b4d85d75.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://1a9cd40a-f0d6-44d4-a143-19288280ca2b.filesusr.com/ugd/7a13df_c631e1f658164392a3e601e2b25e1244.pdf?index=trueIn PDF document text
    • http://pusebirenox.myartsonline.com/powertraveller_mini_g_manual.pdfIn PDF document text
    • https://01c19f78-c7d0-441a-b56a-8672493f87de.filesusr.com/ugd/9d66c7_97a4d8f72e844c16b5b2336697bec089.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sitozi/muzod.pdfIn PDF document text
    • https://a121017b-3fb3-450c-9156-48dd71a9bf80.filesusr.com/ugd/07625c_64f0fdbe3c4c467d99d9e0eb692ff731.pdf?index=trueIn PDF document text
    • http://novupomajanox.atwebpages.com/honeywell_quietset_tower_fan_hyf260_black.pdfIn PDF document text
    • https://s3.amazonaws.com/legenapi/bootable_iso_maker_free.pdfIn PDF document text
    • https://s3.amazonaws.com/nelizenejakarug/building_bye_laws_bangalore_2015.pdfIn PDF document text
    • https://s3.amazonaws.com/xakapudakadu/how_to_draw_beginners_android.pdfIn PDF document text
    • https://60f6da8c-824c-4163-aae9-6195f2ac7ed4.filesusr.com/ugd/7f16bd_8b2bad1a6d3540be8b0b3d44ac6fc34f.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_off000123e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123E5 5072 bytes
SHA-256: 6c74d9961e52a8200df13a83d582ec73a9cb966058f396d0823e0e13f6aef063
font_01_sfnt_off00013527.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13527 11092 bytes
SHA-256: ca2062a89584c7dcec216058fd0233486530ebb96c8359dcb6e0e5947384e574