Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffb18a32a01ac2fa…

MALICIOUS

PDF

78.4 KB Created: 2021-04-06 07:16:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: f6343e29eede7791fcd6da2b44323e54 SHA-1: 24b21bfc190316dc0afd2af369a942196418b4a6 SHA-256: ffb18a32a01ac2facfe50938e8123b83339c395e76f6e2b3e4bb2fa9e3c85f65
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate maliciousness, likely for phishing or malware distribution. Although no scripts were extracted, the structure and numerous external links suggest an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://ponafet.ru/award?keyword=approaches+and+methods+in+language+teaching+third+edition+pdf PDF link annotation
    • http://mainsale.info/qualitative_characteristics_of_useful_accounting_informationcxipm.pdfIn PDF document text
    • http://lnstagram-copyright-confirms.com/what_are_the_steps_to_solving_a_radical_equationfck5a.pdfIn PDF document text
    • http://urologo.store/lejumewidufimizukizorknw34.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457839/normal_60667b5c5721e.pdfIn PDF document text
    • http://educationonline.website/zozajoweaujw6.pdfIn PDF document text
    • http://umdtheatre.ru/2012_club_car_precedent_repair_manual8522k.pdfIn PDF document text
    • http://stikc.xyz/warukesuvugaro1zsy2.pdfIn PDF document text
    • http://barbanapoli.moscow/blitz_brigade_gameplay_androidueyr3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405930/normal_606004a7d6d43.pdfIn PDF document text
    • http://mebel-albero.ru/27336901603d4myf.pdfIn PDF document text
    • https://nurosizakudagag.weebly.com/uploads/1/3/4/6/134699554/lubosotebezeliv.pdfIn PDF document text
    • https://tepewumulu.weebly.com/uploads/1/3/1/3/131384412/komowomofim-buzutajaxome-lajagakom.pdfIn PDF document text
    • http://acupofjacob.com/what_is_a_testing_power_supply7t4zd.pdfIn PDF document text
    • https://ropexosuwewi.weebly.com/uploads/1/3/1/3/131380205/0bd0432fd1.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/e1962e24-b069-4480-a333-cb049c03be57/does_ps4_turtle_beach_work_on_pc.pdfIn PDF document text
    • https://e0fa0743-814d-41de-b6a5-47f787911882.filesusr.com/ugd/89d2ef_f5052dea98a34f0588c4446859510582.pdf?index=trueIn PDF document text
    • https://2d130471-2a64-48ba-87cf-8f1e86c6acad.filesusr.com/ugd/9c43ec_c12da36f6e574f5b9aa0e052e37a9f84.pdf?index=trueIn PDF document text
    • https://8b5ac0f3-2bc4-49a6-9a99-2541af31b215.filesusr.com/ugd/f2ef67_26508244cd1c411295df55dfdd265245.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1d60aa8-e6fa-4f81-b66c-b0a3acc438d3/60326963345.pdfIn PDF document text
    • https://4779f2f8-a33e-4327-9c78-21ee0bcf4620.filesusr.com/ugd/31bf02_0c5563416f23470e888517b7729bb8bb.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e47eddd2-734a-4d77-a8b8-fe64c7c8f787/jumituzimabokure.pdfIn PDF document text
    • https://e20d271a-53e3-41f9-9180-d6cd5f9fd148.filesusr.com/ugd/6cfc61_6d9f65097dec48c987d216a7c5d746fb.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/15210069-3486-4476-805e-c005fd6cf072/26032955143.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_off0000f277.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF277 5556 bytes
SHA-256: b0d4c77b61784278839f5caeff0f1c0dfd6642f37cc97ea264bfc96dc0eb0201
font_01_sfnt_off00010530.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10530 11460 bytes
SHA-256: dd7af26935a6e86c0bf4e8bdddff3e28d7e46cba16b538fb711329efb0ff1240