Malicious PDF — malware analysis report

Static analysis result for SHA-256 b191507a9aca3af1…

MALICIOUS

PDF

83.2 KB Created: 2021-03-23 12:16:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: d8f0f2ec84121b57baafc9407c37927a SHA-1: 1e904da0b6b22174a18d32680169f09ac00d8321 SHA-256: b191507a9aca3af127149284206a617ffc90708e4185ef62464fa72cdc5baf7d
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a common tactic to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://vilenefex.ru/wix?keyword=ib+business+and+management+internal+assessment+guide+hl PDF link annotation
    • https://toxafowusolele.weebly.com/uploads/1/3/2/8/132815148/2447095.pdfIn PDF document text
    • http://ilmahli.com/9499333598ajgf4.pdfIn PDF document text
    • https://cdn.sqhk.co/tajiwikiter/Oiciihd/fozomila.pdfIn PDF document text
    • http://qrettalq.online/nutricion_parenteral_cuidados_de_enfermeriaxuuxy.pdfIn PDF document text
    • https://cdn.sqhk.co/tudobele/Mgchjhe/gusojafuta.pdfIn PDF document text
    • https://rurasaza.weebly.com/uploads/1/3/4/8/134869927/d38ba.pdfIn PDF document text
    • https://xiwupegolowiba.weebly.com/uploads/1/3/1/6/131606046/120d44984817ece.pdfIn PDF document text
    • http://tryporte.xyz/gilajotudazefosokiq8q5b.pdfIn PDF document text
    • http://kinorio5.xyz/flammable_liquid_storage_regulations_ontario7zmxg.pdfIn PDF document text
    • http://carbackseat.site/nhs_barnsley_ccg_annual_reportiolta.pdfIn PDF document text
    • http://storeeu.info/hbs_900_headset_instructions6bal4.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/eae6cce3-9a96-4cbd-9a85-736e42ca6a32/where_can_i_watch_midnight_in_the_garden_of_good_and_evil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e990ab3a-fa20-4ec7-9052-1e3e47466efc/mudeluj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db6d7f80-e74d-4871-baa9-972a61f74a1f/breville_toaster_oven_thermal_fuse_replacement.pdfIn PDF document text
    • https://f8ba888e-8f71-4fde-8303-550399648f4e.filesusr.com/ugd/17ce20_e0df538dea5a4973bb7757ccc7ce990f.pdf?index=trueIn PDF document text
    • https://1e438cd7-6f3b-42ac-a97b-d13a75fa135b.filesusr.com/ugd/0c268c_d0efee7f0e2f412a9b7206f2176d7603.pdf?index=trueIn PDF document text
    • https://e6f9d1db-9bad-45ba-a188-0e8e378e8087.filesusr.com/ugd/99b222_462f050ac6084fb7afad7f2b20b70b06.pdf?index=trueIn PDF document text
    • https://feedbc21-cb93-402c-9ae2-3476589645d2.filesusr.com/ugd/f3ecbe_53a143852f7b4a92b6426211e86fb09e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c98f1114-5be6-487c-aaaa-6e6d403097ad/wudetareno.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_off00010666.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10666 5316 bytes
SHA-256: f20dd4c95ba1b2b4537b84275be041dc4e49d432381dfb7a62d3e2b782fb67cd
font_01_sfnt_off00011846.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11846 11824 bytes
SHA-256: 2db614a941cb551b478f0bb34a8d323d5a1bfe67af3e14dc9998655dfb921d9c