Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3f90dc34c21139b…

MALICIOUS

PDF

75.4 KB Created: 2021-05-19 18:02:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 097f5cb40d49ea3d63835818746c985a SHA-1: b2665d41fabaa73a04adb9217491f8824c99a1d7 SHA-256: d3f90dc34c21139be4e32b1da8b197828687f59758d5f7595fcd2dd6fdf68dc3
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://maypoin.ru/strik?utm_term=how+to+install+bootz+aloha+bathtub PDF link annotation
    • https://getenulezawo.weebly.com/uploads/1/3/4/8/134897364/1034c.pdfIn PDF document text
    • https://pukibasobudez.weebly.com/uploads/1/3/1/3/131379944/c467277d913110.pdfIn PDF document text
    • https://vojerured.weebly.com/uploads/1/3/3/9/133999986/1646465.pdfIn PDF document text
    • https://ganepivojo.weebly.com/uploads/1/3/4/7/134774155/8b83cd63.pdfIn PDF document text
    • https://fogoranamixite.weebly.com/uploads/1/3/5/3/135390362/norozobufa_jexixujilavagin_suvazasukutapa_nadukin.pdfIn PDF document text
    • https://galixasuja.weebly.com/uploads/1/3/4/5/134518214/nirogapabum.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425235/normal_5fd6780862015.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447647/normal_602722808ed67.pdfIn PDF document text
    • https://vedixoba.weebly.com/uploads/1/3/4/8/134864822/5956666.pdfIn PDF document text
    • https://fojawejor.weebly.com/uploads/1/3/4/8/134886237/78a1d.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/adf6766b-d246-4c57-9fb4-37f89d9f14da/dozimugezeg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e40f09d7-e3aa-4041-8a4f-0d3909bbe0dd/34613271383.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d48fdb97-1799-435b-abbe-93bfa3dc0b5b/zanowugutabunodifet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ff4e446-43f6-4fd3-99f6-b3a9f54aa6ef/sportcraft_tx_5.0_rc_treadmill_speed_sensor_wheel.pdfIn PDF document text
    • https://s3.amazonaws.com/wegugus/laser_cut_christmas_decorations_templates_free.pdfIn PDF document text
    • https://s3.amazonaws.com/wamatasamegu/99867070313.pdfIn PDF document text
    • https://s3.amazonaws.com/faluzotixupi/senior_geotechnical_engineer_position_description.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d632d41-841a-4c69-87ae-44832d87a2eb/53221311078.pdfIn PDF document text
    • https://s3.amazonaws.com/vojapu/autodesk_autocad_2014.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6233e57e-2519-4e40-9a98-c3d53e194e72/34764206620.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/afd2af77-820a-4442-b04a-0f301b8c2d18/nololilagarufodijax.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_off0000e85e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE85E 4920 bytes
SHA-256: 4798677202347a8dbfcc498445c3e8027e5240a5d112d5e2b9e9d2830e87174a
font_01_sfnt_off0000f92f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF92F 11404 bytes
SHA-256: ca10749268af5056291e0c2bb67dac3df85226e7b4064ed720f0f73e90e6437a