Malicious PDF — malware analysis report

Static analysis result for SHA-256 b710bf814e80c119…

MALICIOUS

PDF

79.8 KB Created: 2021-03-13 22:16:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: f9b06bb0bbcdeb1d2614de3b3336f97a SHA-1: 22aea58f11287bcb60b0d9b4738892a65bfadb8a SHA-256: b710bf814e80c119d9b51642ce8a40ae688b14762bc40d3678707399ec1cc4a8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9998

Heuristics 5

  • 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 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://dafemum.ru/award?keyword=blessed+are+you+lord+god+of+all+creation+pdf PDF link annotation
    • https://mixojokujize.weebly.com/uploads/1/3/4/3/134387696/temawi-mapidafaxi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449411/normal_6039798e945a8.pdfIn PDF document text
    • http://vugekowuzujed.scienceontheweb.net/how_to_obtain_a_drivers_license_in_arkansas.pdfIn PDF document text
    • http://naturalik.fun/lisa_denton_barkettqidej.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477401/normal_603e8752b6cbd.pdfIn PDF document text
    • http://qqkaxes.xyz/biomass_supported_solar_thermal_power_plantsj0yt.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486356/normal_5fe9178f89e5b.pdfIn PDF document text
    • https://pinipinemijik.weebly.com/uploads/1/3/0/8/130814728/8345324.pdfIn PDF document text
    • http://lifeshop.pro/sujuranaruvapifuwisanapuculqq.pdfIn PDF document text
    • http://belldiscount.ru/47181167651pn846.pdfIn PDF document text
    • http://bumumapa.mypressonline.com/fruity_loops_studio_mobile_tutorial.pdfIn PDF document text
    • https://ganunobagitap.weebly.com/uploads/1/3/4/0/134012575/2592830.pdfIn PDF document text
    • http://vipadobotisituz.mygamesonline.org/loctite_270_datasheet.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/setigafat/80966249448.pdfIn PDF document text
    • http://kivarutumo.myartsonline.com/jemaxe.pdfIn PDF document text
    • https://s3.amazonaws.com/wuniku/in_numerology_what_does_the_number_809_mean.pdfIn PDF document text
    • https://s3.amazonaws.com/fedufiporara/62429742740.pdfIn PDF document text
    • https://s3.amazonaws.com/niporofez/75725953521.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_off0000f7e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E8 5476 bytes
SHA-256: e8b79497d7ddc908081652e48a2e653968cf7e686f3e5abca73ecbea4523f6cc
font_01_sfnt_off00010aa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA6 10812 bytes
SHA-256: a1f5383f49c614c95d3f0244357cd12c057e00613f44b6a9393d02905080cf28