Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f404a542290d805…

MALICIOUS

PDF

89.0 KB Created: 2021-04-01 17:05:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 482ae99e15b9744328a5944a78a44cf2 SHA-1: 109011eaad95b767920e9cab0b37fabc08ff0310 SHA-256: 1f404a542290d805758f2389e7b1ea9d56e37c6baf281cf8e173f1418605cee4
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 0.9997

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://jottigo.ru/wix?keyword=warrior+talk+radio PDF link annotation
    • http://de-bewertung-889562.icu/como_traducir_paginas_de_ingles_a_espaol_en_google_chrome2qxhl.pdfIn PDF document text
    • http://silkhfig.bid/bdo_ka_full_form_kya_hota_haigzv7d.pdfIn PDF document text
    • http://lnstagramaccounts.com/tumejekobo7pc.pdfIn PDF document text
    • http://warewakeb.sportsontheweb.net/91034997230.pdfIn PDF document text
    • http://wegaturagifo.getenjoyment.net/verbe_tre_et_avoir_en_anglais.pdfIn PDF document text
    • http://dobuwiwitevotir.sportsontheweb.net/a_level_physics_dynamics.pdfIn PDF document text
    • http://thrivewebs.com/wezerusoba3n9.pdfIn PDF document text
    • https://jowanubeso.weebly.com/uploads/1/3/5/3/135399775/giniber.pdfIn PDF document text
    • https://tazabojadikeze.weebly.com/uploads/1/3/4/6/134648043/278371.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5abb0bc-0c8d-4c0e-b85b-656911808c26/dudedifojonuloripixiv.pdfIn PDF document text
    • https://9d76d0c6-5807-43ac-a2ba-7b4112d1a20a.filesusr.com/ugd/5cd33b_19d71b246d214e5faa50fe01aaf63e5f.pdf?index=trueIn PDF document text
    • https://dd7ee03d-3646-4e01-a1e1-4c0a7e2c9e57.filesusr.com/ugd/d7ba0f_6705914153af4fcab841b8c35b51d916.pdf?index=trueIn PDF document text
    • https://6ddb26ad-aa8e-4a3e-a925-5cef6fc035e1.filesusr.com/ugd/d3d820_b8064aa40e854e8b84fea0d256c615ef.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/acb31bfa-aecd-4a13-bf1d-fbbf518424e3/91775193259.pdfIn PDF document text
    • https://4bbf79d8-97e4-42de-9a75-948158c354f0.filesusr.com/ugd/52f5d3_20fe97dbfd4d49abab0b43fd1f8fe71d.pdf?index=trueIn PDF document text
    • https://2108ee29-f41f-4224-afb3-8e24ca2f7712.filesusr.com/ugd/279473_3af7f3e5f13243dd83f0fb73476b6394.pdf?index=trueIn PDF document text
    • https://d115d978-d96a-40c8-9764-5d959708fc35.filesusr.com/ugd/436160_0da718ab22f2438e9236b271d59be41d.pdf?index=trueIn PDF document text
    • https://a161ff94-1a6f-4367-b6f8-8e513a5e676d.filesusr.com/ugd/4c7633_12a1aac0c048478cb3616bb4ca542f4e.pdf?index=trueIn PDF document text
    • https://5ce19dfa-329f-495d-88d1-e1e7834d9072.filesusr.com/ugd/d902bb_4374c9f006c241b8a9af8a720e740e70.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f962e19-5d75-4c6c-9a0a-e99d1911e037/did_love_chunibyo__other_delusions_end.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_off00010922.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10922 4716 bytes
SHA-256: ab8522c83d45e7e56d7ccef90ce8cf91fb06e6899f418c5dbab512cf6dcfbc65
font_01_sfnt_off00011947.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11947 11460 bytes
SHA-256: 04a629d41cf30ee47b980b97783eec3effcd6e993aa1835efedba400fd5bcdcd
font_02_sfnt_off0001404f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1404F 16204 bytes
SHA-256: e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15