Malicious PDF — malware analysis report

Static analysis result for SHA-256 bac82729ac0c48e9…

MALICIOUS

PDF

82.4 KB Created: 2021-03-30 02:06:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 4687517f23fbf4e92962808826555e2a SHA-1: cc73696d0fd9cb843cef4adab4bb32a307e09a8b SHA-256: bac82729ac0c48e9822d5dad1fc8aada0caa4154412e37179ad8e07f347a410b
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The ClamAV detection and ML classifier indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and heuristics point towards techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://botokaw.ru/strik?utm_term=ge+washer+timer+diagram PDF link annotation
    • https://vigenawora.weebly.com/uploads/1/3/4/4/134495248/14d02af548e6f4d.pdfIn PDF document text
    • http://sirunome.mypressonline.com/que_es_un_lienholder.pdfIn PDF document text
    • http://waxadod.22web.org/69554559201.pdfIn PDF document text
    • https://jevekezimap.weebly.com/uploads/1/3/4/6/134624871/fc034e45ee.pdfIn PDF document text
    • http://wagumoba.iblogger.org/avengers_endgame_theme_song_piano_sheet_music.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xujided.onlinewebshop.net/sight_singing_book.pdfIn PDF document text
    • https://18cb0a1d-3822-48a5-9ca0-56465202bc9b.filesusr.com/ugd/96564c_2a9eb6234712402baf710eccc47e029c.pdf?index=trueIn PDF document text
    • https://f0198b83-f3fe-41b4-8315-bacd7eabb238.filesusr.com/ugd/2b3f46_cabc6723bf6a4c7ba2ceb2979a84af10.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kefodek/65428568591.pdfIn PDF document text
    • https://cc6d8859-fc08-4100-a073-55b48c5addfc.filesusr.com/ugd/238140_87759392f5154d909e4dd1daf5d3e89d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wajibile/house_on_mango_street_esperanza_siblings.pdfIn PDF document text
    • https://3b0fe5ff-7f86-489c-8138-fc984e51136c.filesusr.com/ugd/bfd78a_80d914578c2543239cf0dabaa602e3f4.pdf?index=trueIn PDF document text
    • https://f16fa5c1-8556-4bba-8f86-04d9c108beb0.filesusr.com/ugd/2c3d75_87d713f3e2534a67ba73bb74b665f2b5.pdf?index=trueIn PDF document text
    • http://vedudide.rf.gd/how_to_use_buffer_solution_ph.pdfIn PDF document text
    • https://s3.amazonaws.com/wajibile/96195697227.pdfIn PDF document text
    • http://xugonowelimije.epizy.com/formation_chef_d_entreprise_btp.pdfIn PDF document text
    • https://s3.amazonaws.com/sevoga/xexalapirigovofekebum.pdfIn PDF document text
    • https://8eccd3b7-fb20-4588-a5b5-4d8c58591879.filesusr.com/ugd/0e6328_806922a93dff4455959c657ce714f459.pdf?index=trueIn PDF document text
    • https://e39bfc17-a898-4016-ac91-fc9303c112df.filesusr.com/ugd/b5068a_04ffd16335704796b27d1afe5144073d.pdf?index=trueIn PDF document text
    • http://zimopup.myartsonline.com/100566387.pdfIn PDF document text
    • https://80172413-d145-4b71-b7cf-4a007d76ad29.filesusr.com/ugd/cacfd7_c8a4f30f94d9455ca2fb28cac936ee6b.pdf?index=trueIn PDF document text
    • http://fojakosi.atwebpages.com/mythic_odysseys_of_theros_races_reddit.pdfIn PDF document text
    • https://s3.amazonaws.com/galinikagopit/thank_you_lord_quotes_for_all_blessings.pdfIn PDF document text
    • https://6f81cef9-66a2-447d-9e1d-4c0427ef15c5.filesusr.com/ugd/4d935e_04205e4f4a9a4ef6838ff31e342a84e2.pdf?index=trueIn PDF document text
    • http://kemesuxaw.myartsonline.com/air_o_swiss_7144_demineralization_cartridge.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_off0000ff04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF04 5332 bytes
SHA-256: 16b14b0da8e9ddc66665b7619c150b40b91b2b1d120b2ffff4e9905344e03d28
font_01_sfnt_off0001110d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1110D 13248 bytes
SHA-256: 0cc984189922a870feb2e975268b74e0ea4904cc032fc25fd583d44eaa55f294

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