Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f70ac9fd42d715e…

MALICIOUS

PDF

101.9 KB Created: 2021-04-10 22:00:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 2a6831c79f403710fa167c4d5b77d5d0 SHA-1: b68eeeb42b214f799034f1fbb722391c71fd92f1 SHA-256: 9f70ac9fd42d715e77a280129ebd9ff654b2674c7a1ac3d06a9c624e0d872ac3
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 0.9998

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://nipisod.ru/strik?utm_term=asus+p7p55d-e+lx+manual+pdf PDF link annotation
    • http://wurilozi.scienceontheweb.net/bsc_pcm_syllabus.pdfIn PDF document text
    • http://kufejat.sportsontheweb.net/gigowetesetuzibixob.pdfIn PDF document text
    • http://makululi.iblogger.org/fefulekazojabuvuxawol.pdfIn PDF document text
    • https://mamasikixatok.weebly.com/uploads/1/3/5/9/135961158/9865552.pdfIn PDF document text
    • https://nawuwisenaz.weebly.com/uploads/1/3/5/3/135318134/8c1ebec19402dfe.pdfIn PDF document text
    • https://mixuvuweti.weebly.com/uploads/1/3/1/4/131483588/notagixe.pdfIn PDF document text
    • http://wivevemeb.scienceontheweb.net/89222994421.pdfIn PDF document text
    • https://www.comx.co.zaIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://fd0ef26f-7b8f-4c91-b3b2-19f7ec93487a.filesusr.com/ugd/4174bf_8e1ea58224de4e3a961e66c49806a279.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zabejuvijolu/what_is_artificial_neural_network.pdfIn PDF document text
    • https://944456f3-75eb-4cd6-bbfd-656b3713ada1.filesusr.com/ugd/2c8d66_70ee8ccfc60e4f2295c203539b74e6e7.pdf?index=trueIn PDF document text
    • https://1160a196-6e18-49bd-931c-438029629b47.filesusr.com/ugd/40338c_a27ace65f70b46feb471d81c5334f767.pdf?index=trueIn PDF document text
    • https://16fd3b15-5541-4454-9538-28daacbf497e.filesusr.com/ugd/e32576_d703b3f97eb14bc0b48f376d56bd089f.pdf?index=trueIn PDF document text
    • https://ced6af22-cf5f-4df0-9cd6-2d424634d287.filesusr.com/ugd/3eed2b_524405d2ab1b44318bedfe2a4edf532b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/banula/fresno_bee_fishing_report_sept_25.pdfIn PDF document text
    • https://a1b876fd-e98f-4594-996d-fc523792ae9e.filesusr.com/ugd/efcbf0_a6c17608e55d4f2f9f6313d9577d51b1.pdf?index=trueIn PDF document text
    • https://ac402fee-74f4-49a6-b5a4-6a03c6a057de.filesusr.com/ugd/b0cd75_790bf2a504564e2cb745a5dd934d821b.pdf?index=trueIn PDF document text
    • http://kokibitumoxa.epizy.com/magnesium_ribbon_experiment_lab_report.pdfIn PDF document text
    • https://8f1c0ae7-1ba6-4c51-a623-4d29f5e3aebb.filesusr.com/ugd/c1615c_b6a98a4325674c57abc073744600dd02.pdf?index=trueIn PDF document text
    • https://6ddb26ad-aa8e-4a3e-a925-5cef6fc035e1.filesusr.com/ugd/d3d820_53ce8cf6183e431391af84e47d99c856.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pajeriramal/dovumoji.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000137ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137EC 5384 bytes
SHA-256: 25233efcba705964b6dda320ffe81a2e76fc4408fadf6616e8ad9b7772c576ee
font_01_sfnt_off00014a4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A4D 12976 bytes
SHA-256: e220f5811a141bd7462a07982e3ae210a51055ccea4e70734deac4e322f4f02b
font_02_sfnt_off000174e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x174E6 16204 bytes
SHA-256: c988415812f594187b0a0ed75dc52802e798e1695b49bd300f8412a65040a449