Malicious PDF — malware analysis report

Static analysis result for SHA-256 a66d547c9198f96c…

MALICIOUS

PDF

75.7 KB Created: 2021-06-06 08:50:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 6143ef483ba14ff2c87cf9d76fae8891 SHA-1: 59b33483a0619e4ee28874807a7b041ff54a485f SHA-256: a66d547c9198f96cb8dbc20e798f9927ccf4c4c7ef0997a581bfd8c6e99cb3c7
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 hosted on disposable domains, suggesting a link farm or phishing operation. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links point towards a malicious document designed to redirect users to potentially harmful websites, likely for phishing or scam purposes.

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://irlanc.ru/pbw?utm_term=how+to+install+pull+up+bar+on+door PDF link annotation
    • https://segamivudafipem.weebly.com/uploads/1/3/2/7/132740242/xewonebupotitapev.pdfIn PDF document text
    • https://batusapetedovug.weebly.com/uploads/1/3/0/8/130873971/sirikovike-bedobarunojevaj.pdfIn PDF document text
    • https://lufojegixibebaz.weebly.com/uploads/1/3/1/4/131407324/7b300.pdfIn PDF document text
    • https://ripixupazina.weebly.com/uploads/1/3/5/3/135343237/tiwejamerolita.pdfIn PDF document text
    • https://xuzexutibezime.weebly.com/uploads/1/3/4/9/134904436/tuteravejotaje.pdfIn PDF document text
    • https://lujadogube.weebly.com/uploads/1/3/4/5/134522393/puxaku.pdfIn PDF document text
    • https://noribazab.weebly.com/uploads/1/3/1/8/131871745/1810984.pdfIn PDF document text
    • https://dubobovutorikug.weebly.com/uploads/1/3/5/3/135332124/waligapevinede.pdfIn PDF document text
    • https://belinadojo.weebly.com/uploads/1/3/1/6/131607131/refiwixesafoju.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://taxexuwej.pbworks.com/w/file/fetch/144431514/nesters_microbiology_a_human_perspective_9th_edition_citation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a02e28b7-c4a1-475f-9cbc-6d5c11ca0618/9840467883.pdfIn PDF document text
    • http://fuxedemama.pbworks.com/f/bobitegarewapaxojoli.pdfIn PDF document text
    • http://kibumezi.pbworks.com/w/file/fetch/144711360/61626056196.pdfIn PDF document text
    • http://vedufid.pbworks.com/f/29809488093.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a953ea7-25ee-4630-a0bf-a743aa34dc71/momuripupizimuxifajet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec8c1bc4-c2fa-428e-83e1-1f0be8ab72c6/air_force_1_shadow_pink_and_yellow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2152558-c02f-4e96-903d-84cc27d7295f/38614071128.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0bb71334-f39f-45a7-9b0c-d9d6de657216/gometurewigezin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a2c4c2f-ff50-4f34-887f-8e6a423f090b/90844371027.pdfIn PDF document text
    • http://kusarolox.pbworks.com/w/file/fetch/144578280/very_hungry_caterpillar_story.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/709529e3-886f-43fc-9ec4-7369697374b3/is_push_pull_legs_effective.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5bb2a3fd-5561-4d6d-bd71-94ab5b995e3e/67497477167.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF3F 4912 bytes
SHA-256: a57f3cd0e8c67479db5aae640cdaba0197726d30c0a66a1293183e79269e7904
font_01_sfnt_off0000efed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFED 10268 bytes
SHA-256: 33f3810b5a34a4f2fa0431f24ddf5aecf62bf1413b0395474e5604fc186817b9
font_02_sfnt_off0001132f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1132F 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34