Malicious PDF — malware analysis report

Static analysis result for SHA-256 95556e57ce349b8b…

MALICIOUS

PDF

83.9 KB Created: 2021-03-15 14:00:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: a8375a9e9f0cb45fd3e989dc51ccd277 SHA-1: 7afcd6fdf97ef1d15669f549199ab75bce7631b5 SHA-256: 95556e57ce349b8b97382084e2db1ffff4388e6cd14652687d1f99b7822896a0
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external URIs pointing to various domains, likely for SEO manipulation or to host malicious content. The presence of multiple external links on disposable hosting services further supports this assessment.

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://midufefew.ru/strik?utm_term=logitech+extreme+3d+pro+joystick+review PDF link annotation
    • https://nesipemuwazona.weebly.com/uploads/1/3/4/8/134881126/gatezedejigotod.pdfIn PDF document text
    • https://cdn.sqhk.co/vanewano/hhhdhem/53933546085.pdfIn PDF document text
    • https://cdn.sqhk.co/moromasi/hgiiTgc/fall_stardew_valley_guide.pdfIn PDF document text
    • https://wonikisemuk.weebly.com/uploads/1/3/4/9/134902350/ee1241e59e5a.pdfIn PDF document text
    • https://pilidikuvitas.weebly.com/uploads/1/3/4/7/134766888/feripululelozaviti.pdfIn PDF document text
    • https://cdn.sqhk.co/kejofuvata/7Jjfrj6/1861269189.pdfIn PDF document text
    • https://dopotalufiru.weebly.com/uploads/1/3/4/6/134601398/e3781f6.pdfIn PDF document text
    • https://jasesokotu.weebly.com/uploads/1/3/4/4/134499989/4366009.pdfIn PDF document text
    • http://duzusedolatepe.mypressonline.com/child_emotional_development.pdfIn PDF document text
    • https://cdn.sqhk.co/wobuwozavenu/HjbgclB/togefibelukifotoje.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nebojemesiwi.atwebpages.com/12936291561.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38545a46-2805-4a35-be34-bf82b6bc37c5/82500668773.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87e0f94b-aaf0-4226-ab91-90b89300a81a/70348767567.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8662298-c780-4bf9-b173-5c973b9e68c5/36108024598.pdfIn PDF document text
    • https://6ddb26ad-aa8e-4a3e-a925-5cef6fc035e1.filesusr.com/ugd/d3d820_90bbc39667c447aa9b8d981a9e8ba444.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/092cce94-2d24-412f-8005-39502bb9ed79/the_boy_in_the_striped_pyjamas_movie_short_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2bfe2e30-4a4b-4c1c-b637-7676886c078f/masatewesemabirod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/09cf3dd2-263e-4e1d-b31b-fd10c544ee84/dimebopowajirujojuwodeso.pdfIn PDF document text
    • https://4fdc5cb1-0646-4ed0-9ac1-f9332ff2c333.filesusr.com/ugd/9b9480_2393022f989544a4920d88b771b4344a.pdf?index=trueIn PDF document text
    • http://tuwutexo.onlinewebshop.net/reebok_club_c_cardi_b_womens.pdfIn PDF document text
    • https://ae8c1479-5121-4009-b0ed-8259dbb1205b.filesusr.com/ugd/0aff45_0d04dcfc1b8540c18d77fbb8bf694c85.pdf?index=trueIn PDF document text
    • https://696f1bd8-06c3-47a7-a8f7-e83e17ec8d18.filesusr.com/ugd/5ad03d_80c6a35fb5244690adb775be66c629fd.pdf?index=trueIn 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_off0001079d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1079D 5812 bytes
SHA-256: b129ddf7e9bea559ecde301f67111226197915b7bbb7f6589bfbb584c376b5ae
font_01_sfnt_off00011b65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B65 11368 bytes
SHA-256: 1487d5d6bf9037e240c5dceeee1cd7a19d8740474f5c55868e965c8abf84211a