Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfd8591e1590d4a4…

MALICIOUS

PDF

75.8 KB Created: 2021-03-28 09:52:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 35dffd26bd43772de0dc977c93f577de SHA-1: ac540c5811638bc2a714775cc9d68546b50760be SHA-256: bfd8591e1590d4a40d0fe5c6d9cabc17107c25d283ef42350ab5d557d430f657
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document is identified as malicious by multiple heuristics and an ML classifier, and is detected by ClamAV as a phishing trojan. It functions as a link farm, directing users to numerous external websites, including one identified as a potential phishing lure. The document's content is minimal and appears to be a deceptive lure to encourage clicks on these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://jacksth.ru/wix?keyword=text+box+generator+css PDF link annotation
    • https://wotawodakel.weebly.com/uploads/1/3/5/3/135316359/9941525.pdfIn PDF document text
    • https://warolola.weebly.com/uploads/1/3/4/6/134600536/ba4cbbbaf3e1.pdfIn PDF document text
    • https://lavozeto.weebly.com/uploads/1/3/0/7/130775819/zitanepijozeb-ribiz.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/69f184f9-9b8a-419c-8e79-159658a34791/rabunedoxudafona.pdfIn PDF document text
    • https://s3.amazonaws.com/tazibabebamep/chromecast_apps_for_android.pdfIn PDF document text
    • https://17851959-1482-4b49-8222-7b7b0c628459.filesusr.com/ugd/3cb679_2921e04f81f04c7db27d2ab6f3df1b39.pdf?index=trueIn PDF document text
    • http://vatimofaxemog.rf.gd/chronicle_of_a_death_foretold_study_guide.pdfIn PDF document text
    • http://furugavasipif.epizy.com/57039518285.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc2cf754-94ee-4ad2-b3dd-e76fb420405d/25449160928.pdfIn PDF document text
    • https://18d8f76e-0bdd-4b96-b744-fee987eed1b0.filesusr.com/ugd/1486c8_2dc03eb9157045f2ab9fc61dde143e1e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/232c96a4-3ef5-4fc4-99bf-ae486a17817e/96642405777.pdfIn PDF document text
    • https://0e67983c-e844-40c9-b604-97311ec94efe.filesusr.com/ugd/6e13d9_5529255cc95c47bd8bc8cca818710bdb.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jonora/95000866107.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a326885-3764-42ea-a063-ef6162fd26e2/what_are_the_four_stages_of_second_language_acquisition.pdfIn PDF document text
    • http://mukadepokexow.epizy.com/gijabededo.pdfIn PDF document text
    • https://s3.amazonaws.com/xotomisen/vuwoxisuwupigabi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7fc64a2-fd04-41c5-b40e-d9a8b53b4a7f/bobalokekirune.pdfIn PDF document text
    • https://c3e810f9-371e-40b9-9a0b-4695a496ec77.filesusr.com/ugd/2c7c49_3ea5a1b5d4ac454fa8504dcb659b0368.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/muxegeza/cheesecake_factory_skinnylicious_menu_nutritional_information.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1938a7e-37a1-4933-baf9-db72a1ca6c24/ipod_shuffle_not_charging_windows_10.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9bd2265-6b39-4d7b-9451-ebeed669fe97/jeregiladuvenidivusiwab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cac96aeb-7a52-49a8-a4f0-739e87434acd/lotexonujiwo.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_off0000e7f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F7 5092 bytes
SHA-256: 829bd776ee6256b8ff7d74852885cc41bd9f7a94508ba8bd18e7a3dfb9c3c2c7
font_01_sfnt_off0000f95c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF95C 12068 bytes
SHA-256: 54df6764b6765b1957a90b84806532e303b736b523a86137ceebe742e15d0f80