Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7ff022075ec6199…

MALICIOUS

PDF

136.7 KB Created: 2021-03-21 11:00:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: d6b969ed22b76bfc01fb2b1e8d19f924 SHA-1: 51a645da58b2db31ba32bab7761fa3ad692220ac SHA-256: a7ff022075ec61991c9b8e8a15bf141edc67212a6eddf34f38e10b5ab339e433
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, which is indicative of a link farm used for SEO manipulation or to distribute malicious content. ClamAV detected this file as 'Pdf.Phishing.Trojan', and ML classification returned a high probability of maliciousness. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://lozipotod.ru/award?keyword=consumer+behaviour+articles+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4379722/normal_5fde051b127af.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365624/normal_5ffed2225a6a3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377403/normal_6012c220abfef.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467019/normal_5fff39b8c3c50.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382629/normal_5fdc97465120f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://2d2b1dae-c014-4902-97e6-c3f1d56915cd.filesusr.com/ugd/70e5f7_a132fcf27f3f44988631d34348c30ecb.pdf?index=trueIn PDF document text
    • https://b595a6f9-6bcb-48d8-acfc-7cb8c696cf55.filesusr.com/ugd/21f311_42d59f2718d14894af1f36eec4e6bce2.pdf?index=trueIn PDF document text
    • http://wegugoleta.onlinewebshop.net/jodemujapar.pdfIn PDF document text
    • http://besafetusupug.atwebpages.com/livro_segredos_da_cabala.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b672a2d4-3dff-45ea-a8bf-89735f1fb968/50495187788.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/09e6e2ff-6ff8-4188-959c-65ba7e7e7b9e/52859040713.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d515519-706d-4058-bcf4-b65d2fa746c6/super_mario_sunshine_multiplayer_mod.pdfIn PDF document text
    • https://ac4cd5cf-e861-4b1b-a585-e47049f737a6.filesusr.com/ugd/843280_0afaaafb69634b858292e866d22a17b4.pdf?index=trueIn PDF document text
    • https://45f91bdd-2b68-4e60-ae2c-b14373ae5332.filesusr.com/ugd/0d089b_ded18eb4440744f481e15d9a94d37f4b.pdf?index=trueIn PDF document text
    • https://e0bfa911-60eb-4c53-bd8d-ceec25156dfb.filesusr.com/ugd/0a052f_e92f04338c33404887cfd102176e3618.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tubukeganuji/dugominiguvunosimuma.pdfIn PDF document text
    • https://s3.amazonaws.com/sazomo/46999081998.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6f7cb8e-429e-41f2-b87c-72f3ba40b376/92265784897.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46bf5a35-7e44-4376-a381-a0ec367ecba1/tininusaramadewudinetipa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/017e1267-286d-418c-8624-4b5341b7191b/jozawajejikuzo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7443f501-5e3e-4a5c-b215-8a708e56083e/how_to_reset_omron_intellisense_blood_pressure_monitor.pdfIn PDF document text
    • https://s3.amazonaws.com/kefiperizonofu/zovojovosepabijodapanum.pdfIn PDF document text
    • https://s3.amazonaws.com/vedexajawo/42607189257.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_off0001c344.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C344 5500 bytes
SHA-256: 7ac772fb23e3ba048f072d3651508d98f9a281999c9486eaab1a4cfceee379a3
font_01_sfnt_off0001d5c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D5C9 13024 bytes
SHA-256: e245a7d202bf0babc34cd8c692125f2f017ab4004ebcb15f8fc4152f9df0dd45
font_02_sfnt_off0001ff58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FF58 16060 bytes
SHA-256: 99ddc6f5858eb134f8024171ebe717cbd02485c31471b921a5021903b5272953