Malicious PDF — malware analysis report

Static analysis result for SHA-256 6aa408539a28cba9…

MALICIOUS

PDF

75.4 KB Created: 2021-06-05 00:10:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: f0a49cd50615933851be27e61c2a5664 SHA-1: 0ef73c699705811b759c3cd50fa2dc659f2e7a9e SHA-256: 6aa408539a28cba9c9d78df2d076376230b485dca603266a000cf81d1cc63709
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 pointing to disposable hosting services, suggesting a link farm or SEO spam operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://nomylo.ru/pbw?utm_term=how+to+read+mantoux+test+report PDF link annotation
    • https://kalaxokesipak.weebly.com/uploads/1/3/4/8/134888683/b9e2c7550c56628.pdfIn PDF document text
    • https://fujubonutebi.weebly.com/uploads/1/3/4/2/134266124/bofojonakowopupunid.pdfIn PDF document text
    • https://xovirekines.weebly.com/uploads/1/3/4/6/134648888/dosotixatezevaj.pdfIn PDF document text
    • https://jikumudepopojet.weebly.com/uploads/1/3/1/4/131453433/tujodagof-kojorukewi-jafofesibow.pdfIn PDF document text
    • https://ximixejolulozo.weebly.com/uploads/1/3/4/3/134351986/lolim_xenujo_xawukopalo.pdfIn PDF document text
    • https://daxogane.weebly.com/uploads/1/3/2/8/132815110/dab7a56ef5.pdfIn PDF document text
    • https://xofeboje.weebly.com/uploads/1/3/4/5/134584890/fobozagubif_wuxonogepawomor_rowigafaponore.pdfIn PDF document text
    • https://zerexiborugixa.weebly.com/uploads/1/3/4/7/134705556/e3e8e589f24ecf0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://biduzoku.pbworks.com/f/download_driverpack_solution_13_offline_installer.pdfIn PDF document text
    • http://mapaduzipi.pbworks.com/w/file/fetch/144603345/21535000036.pdfIn PDF document text
    • http://zewalar.pbworks.com/f/big_ideas_math_geometry_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31393d76-10c8-4a8f-a8f8-7408574d9035/dyson_dc35_replacement_filter.pdfIn PDF document text
    • http://wuwazilizos.pbworks.com/w/file/fetch/144425859/noretakikinaj.pdfIn PDF document text
    • http://bibosopimugo.pbworks.com/w/file/fetch/144630099/minecraft_bedrock_hack_client_1.16.200.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21bf992a-c468-45df-a6c2-2291ca70e4f7/how_to_apply_ehsaas_kafalat_programme.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1061e683-31d1-4094-b2f3-45e2f0479b88/free_v_bucks_generator_no_human_verification_ps4_2020.pdfIn PDF document text
    • http://mumubib.pbworks.com/w/file/fetch/144413319/52491265280.pdfIn PDF document text
    • http://sepaxebi.pbworks.com/w/file/fetch/144413991/set_up_google_home_on_windows_10.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4162aaf0-e4a7-4666-b7d3-04c9456dce51/winning_the_losers_game_8th_edition.pdfIn PDF document text
    • http://xizisimavi.pbworks.com/w/file/fetch/144543423/dipiro_pharmacotherapy_handbook_10th_edition_free_download.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_off0000ec05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC05 5196 bytes
SHA-256: 78c84a35c31dfb7b72e76d94635276f04c4de60fd3c214bff5249af4f68b721f
font_01_sfnt_off0000fda6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDA6 10196 bytes
SHA-256: fe24e6dfcdff1a069539e8a860fad678ae6137b4a4b316cc70c1e19658b34c5e