Malicious PDF — malware analysis report

Static analysis result for SHA-256 add51efe6ed9f3e8…

MALICIOUS

PDF

78.3 KB Created: 2021-06-11 12:00:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 9a22f5c47bea28ebb936f3c000e93be2 SHA-1: aec8c5436bb061800cc07bea00327dc09bc47518 SHA-256: add51efe6ed9f3e846b290ae626e619a334fca56a057249eff4fb0ffc3699ba5
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable hosting, suggesting a link farm or SEO abuse tactic. The ML classifier and ClamAV detection strongly indicate malicious intent, with the primary URL being a potential phishing or malware distribution point. No scripts were extracted, but the PDF structure and external links are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://inwebjor.ru/pbw?utm_term=bon+appetit+song+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4485152/normal_60659e638fd9b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477913/normal_600b57b6addad.pdfIn PDF document text
    • https://texejuzaw.weebly.com/uploads/1/3/0/7/130775796/bijel-rozejisarefu.pdfIn PDF document text
    • https://jawibonudinozof.weebly.com/uploads/1/3/4/5/134584949/gererixujegek-fevubo-gokorukezi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495257/normal_5ffa228015e3e.pdfIn PDF document text
    • https://xamatokixixite.weebly.com/uploads/1/3/5/3/135336409/9f6523b82371da8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zikupuzajix.pbworks.com/w/file/fetch/144444567/pubimefuxofejefazi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f570294-0026-441e-884b-18eada8f38cc/can_you_use_wii_u_controller_on_switch.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ffa7b45-caec-45d7-a9c2-ca58ad50365f/peppered_moth_graphing_activity_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/faf8f8a0-1f97-450e-8fbb-24ff1b8b0f00/are_home_drug_test_reliable.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6eb2046-37de-49c1-a353-c90441ac6c6b/64357280099.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/315b9f3c-0401-4975-be2e-394689c6e44b/adobe_premiere_pro_free_download_for_windows_7_32_bit.pdfIn PDF document text
    • http://kiletejude.pbworks.com/w/file/fetch/144412083/26746792705.pdfIn PDF document text
    • http://bipuwetek.pbworks.com/w/file/fetch/144811191/du_bois_the_comet_summary.pdfIn PDF document text
    • http://magobok.pbworks.com/f/jinerenakevukujakoza.pdfIn PDF document text
    • http://latojelu.pbworks.com/f/51205801012.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d2111b2-ef03-46bb-ac68-fd62cbd5460d/vevegokupuzevekeza.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e7902ce-6d70-4d6a-8e96-c3e30a8ed8b7/how_to_connect_using_wps_pin_entry.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/449613ee-a567-40a5-975f-19a0f74e1e67/65922677021.pdfIn PDF document text
    • http://dijakezepo.pbworks.com/f/bevoz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e202cee-12e7-4aef-9e45-04cadd371183/what_kind_of_battery_does_a_weight_watchers_scale_use.pdfIn PDF document text
    • http://suzojadek.pbworks.com/w/file/fetch/145131327/spelling_connections_grade_2.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_off0000f378.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF378 5172 bytes
SHA-256: 1a18eb330cf7252a635371f249350e7934a62f2f163bd720c47e4ed4e68c4607
font_01_sfnt_off00010537.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10537 11276 bytes
SHA-256: 5cc14bc06e7bd3855f4db34da38e9e3be779cda4b20882dfaf5283a5960112da