Malicious PDF — malware analysis report

Static analysis result for SHA-256 62b8d24113e9ede4…

MALICIOUS

PDF

79.5 KB Created: 2021-05-06 08:37:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 41bfadab785d5978b775aa5179cabc9f SHA-1: ca78d7f918da5c6993d6c4bc6b5feaa3698e6f06 SHA-256: 62b8d24113e9ede4f5cec5f422fb4e1c1d9ca5857b1f8d5105a5948814f9bd31
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 pointing to disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URLs are indicative of a phishing or SEO spam campaign, potentially leading to further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://nipisod.ru/strik?utm_term=habit+reversal+training+skin+picking PDF link annotation
    • https://suzixibaru.weebly.com/uploads/1/3/4/7/134709676/tivupakowufal.pdfIn PDF document text
    • http://naturwow.space/trombone_quartet_sheet_music3p7y7.pdfIn PDF document text
    • https://givetowa.weebly.com/uploads/1/3/1/4/131437183/lafurekuxegijowoz.pdfIn PDF document text
    • http://luxshop21.site/97389231505e4yqb.pdfIn PDF document text
    • http://tikovg.xyz/how_to_choreograph_a_dance_solobybuz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443824/normal_600f91b9728bb.pdfIn PDF document text
    • https://gubilipolijig.weebly.com/uploads/1/3/4/7/134707964/gogomuvum.pdfIn PDF document text
    • http://bigops.fun/427798039964082l.pdfIn PDF document text
    • http://losewunisa.22web.org/jelojal.pdfIn PDF document text
    • https://guzejanum.weebly.com/uploads/1/3/4/6/134681017/c96019b9a33b9.pdfIn PDF document text
    • http://gulakami.22web.org/gelatin_sheets_wegmans.pdfIn PDF document text
    • http://teksol.xyz/how_does_the_phases_of_the_moon_affect_usezb7d.pdfIn PDF document text
    • http://zawimumerefop.iblogger.org/solution_architect_interview_questions.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367286/normal_6052aa3632386.pdfIn PDF document text
    • https://zobojosapez.weebly.com/uploads/1/3/1/4/131483592/nizaxakofavezerinewu.pdfIn PDF document text
    • http://desekikimok.22web.org/702793611.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ed59cdd8-0d75-4634-8bb2-7afdb9da103e.filesusr.com/ugd/9cb112_bf8b84da92044d74a8991e5323f33884.pdf?index=trueIn PDF document text
    • https://123949be-7110-4ba3-a240-a7df06fb38ce.filesusr.com/ugd/80fd5d_a2cad50a9f894f74884c803f1290b96d.pdf?index=trueIn PDF document text
    • https://f7b0ef4b-317e-4f07-901b-4de91a029b50.filesusr.com/ugd/50f142_9906dc1134c14d7e80d37c1ac400aef8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/22c67769-d033-43af-b8ae-9ba130dc5ad0/what_is_principal_stress_and_strain.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b5181fe-59f4-49cd-b3e7-aa250ccf2b1f/digitech_gnx3_factory_reset.pdfIn PDF document text
    • http://jikudifotiwobij.epizy.com/20174897189.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ae00d1a-5235-49e2-9169-f70e09e09a7e/belabokitexexibotutepol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/35479e7b-cf13-40b9-b2d9-cca1c03b3352/research_methods_in_psychology_4th_edition_publisher.pdfIn PDF document text
    • https://d429d46a-6203-486b-8c9d-ede5597e1383.filesusr.com/ugd/419b00_e1702166f6c44a9c8dedd27ccff21c03.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_off0000f729.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF729 5328 bytes
SHA-256: 7ce419e9804cc82c7f7773e2adaf373c67def79f0358d2ce5b95c6d5a51c63e4
font_01_sfnt_off0001095a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1095A 10896 bytes
SHA-256: 53b712fea11739ae75660eda42e0f0a954c9461710de251778278d49751c364e