Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8b650c5eadbfee8…

MALICIOUS

PDF

72.8 KB Created: 2021-03-12 01:10:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: d17a47ab30a205c7c671b9e0668a5077 SHA-1: 919acc431b744cfad0e08d004e59981b70a2b2b8 SHA-256: b8b650c5eadbfee88d695dc54e73eaa63e74d2d245d2a23ac3321d2b7cdeaf64
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 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://resalured.ru/123?utm_term=asus+smart+gesture+driver+windows+8.+1 PDF link annotation
    • http://jofosisajagov.iblogger.org/frontline_commando_ww2_mod_apk_latest.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493545/normal_5fe2d90fb5607.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405895/normal_5fdf06149a039.pdfIn PDF document text
    • http://batmbatm.ru/nufixebenixojaqk4vx.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492575/normal_5ffb30e4ca432.pdfIn PDF document text
    • http://xojokare.iblogger.org/midawazuvepugubegavom.pdfIn PDF document text
    • http://allieshouseofhope.com/girl_guides_of_canada_brownie_badgeszedwy.pdfIn PDF document text
    • http://apsmall.space/the_chainsmokers_paris_mp4_videonqw1w.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wipobusev.rf.gd/the_standard_college_station_email.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d471fda9-3618-4caa-a9ac-f2c53ef80b1d/uad_eventide_h910_review.pdfIn PDF document text
    • https://45b0b119-5f8c-43e7-b437-4e12d17c1c81.filesusr.com/ugd/3826db_ad2f9f9004174f1b85da86b40360cbd3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a16d1f10-b0ec-4363-abb6-dfa5935b1a3c/how_to_use_cricut_design_space_with_expression_2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46194b71-416d-4244-90df-3bb13e6b5822/reduzubavov.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1db3f8a-51f4-47b7-8ad9-b29ad31c83a4/23951609420.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/979a3eb8-e19e-49c0-9cc6-0ff763ee58b7/fodoxofiw.pdfIn PDF document text
    • https://99442e0c-e188-470f-b1e9-a2082f9e7f28.filesusr.com/ugd/2274a7_1efed8f91dd345b587a526b04062faf5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec286126-d873-49c9-913c-83cad75b14f7/allen_carr_weight_loss_method.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ceb40841-48fb-4e07-8229-5d5e69014928/reclaim_your_heart_in_urdu_download.pdfIn PDF document text
    • https://a804c8a8-fdf7-4fba-b19b-c23aecc29597.filesusr.com/ugd/a7074a_ed63be342fe24e438dff32c0ccc06568.pdf?index=trueIn PDF document text
    • https://44bb6ee8-a0fe-4f72-890f-0f0a2fec05cf.filesusr.com/ugd/b65acf_2d6f137128aa4a159c5cf321a380c4ee.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/834af051-fbc3-4d8d-8e88-63353196299e/daxaboxigofufovebinaxe.pdfIn PDF document text
    • https://05282879-aed3-4f16-ac14-d534add4d4bd.filesusr.com/ugd/0f8b7c_312e8c3aa9fb48f39e7360cd65e67236.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_off0000d8c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8C5 5532 bytes
SHA-256: 68338115739b644cd4aef53370ea7397e2a7d16b0f5f1afa883d95b6997d3c2f
font_01_sfnt_off0000eba3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA3 12624 bytes
SHA-256: 09c56b5f1dd4fb140d344934671537779c127ea9aef704ca41f416ede188be15