Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb98d83d0ff9fb19…

MALICIOUS

PDF

75.9 KB Created: 2021-03-07 13:05:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 631134f94c5e75b3e961c5c81b8a1ee8 SHA-1: 1af3f6fffcd7a66f13f686392ef82ab80cdd1d96 SHA-256: eb98d83d0ff9fb19219849689edb0d185d1aaa64759068a8902205ceddac1fd3
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://pelibifir.ru/strik?utm_term=how+to+build+a+copper+reflux+still PDF link annotation
    • https://saxenivimagi.weebly.com/uploads/1/3/0/8/130813604/73e3471d2b0c.pdfIn PDF document text
    • http://zumewidife.mygamesonline.org/javanamajugotekusukiwaka.pdfIn PDF document text
    • https://tusubolamofe.weebly.com/uploads/1/3/5/3/135322079/matuzifinan_pewukaliwi_zusemevelevidop.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471686/normal_5fd8f0ced0d08.pdfIn PDF document text
    • https://wumetitazidizo.weebly.com/uploads/1/3/4/8/134885052/tujuridon_xatuxapulopewul.pdfIn PDF document text
    • http://gepexoliv.medianewsonline.com/how_deep_is_lake_worth.pdfIn PDF document text
    • https://cdn.sqhk.co/govazofaj/jujjjja/piffle_ball_crossy_road.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369926/normal_600930bd57681.pdfIn PDF document text
    • https://wuguruxozoza.weebly.com/uploads/1/3/4/0/134040539/187617.pdfIn PDF document text
    • https://cdn.sqhk.co/naxibibu/gctM4Yh/square_body_chevy_truck_bed_for_sale.pdfIn PDF document text
    • https://cdn.sqhk.co/pexudolifa/drjc8jf/apulien_reisefhrer.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456119/normal_6034dc7ae612d.pdfIn PDF document text
    • http://pimifawimonidij.mywebcommunity.org/pixma_mx430_driver_download.pdfIn PDF document text
    • http://bowofonu.22web.org/gebad.pdfIn PDF document text
    • http://rasiride.22web.org/fesunaginulowokiwazusote.pdfIn PDF document text
    • https://xowitato.weebly.com/uploads/1/3/0/7/130776358/xaxesikud.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454965/normal_603480f2c0003.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://bb55feb6-a0c4-48ae-8f72-aea2c45912f8.filesusr.com/ugd/b9801a_bccb229876ca4315be85a3f77b649b0a.pdf?index=trueIn PDF document text
    • http://sogivuwe.onlinewebshop.net/1424114386.pdfIn PDF document text
    • http://xubudexev.epizy.com/hey_brother_chords.pdfIn PDF document text
    • https://584abdf6-e408-48d3-a53c-4313a8f82471.filesusr.com/ugd/18ee90_5b2d69d919c3475bab8ed7b50752082d.pdf?index=trueIn PDF document text
    • https://a5fc3680-5c08-4cda-bd6c-abaa3bdf25bc.filesusr.com/ugd/ea5d7b_4433fe127d7740cbb48e6582b73d2b83.pdf?index=trueIn PDF document text
    • http://dodekogizur.epizy.com/hunchback_of_notre_dame_musical_topsy_turvy_lyrics.pdfIn PDF document text
    • https://15319a82-8c66-4906-b3c2-464277991f2b.filesusr.com/ugd/070acf_ce4f68a0d9034cd5a9080515c3eb530e.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_off0000eb8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB8A 5408 bytes
SHA-256: 9b3ed3a07e5bfc941344bb6c75440b55e1f52c2a5c2bce3edaacc2ffe7f5f02e
font_01_sfnt_off0000fe0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE0A 10668 bytes
SHA-256: d77679f57f078d0626d8165ee5454070b5b63e2c4e6eb237e0cb7ee2fead51c8