Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5b769ac506d63fc…

MALICIOUS

PDF

86.5 KB Created: 2021-03-03 07:52:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 0002c6989ea1513ed265b9f56907cf6a SHA-1: 8c4e82165e375a11d6c31560bff47917cf144ec5 SHA-256: d5b769ac506d63fc1920c010e74f87abe95c688cf04f4b3e28e6302ec2fc8796
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links pointing to various domains, many of which are hosted on disposable or suspicious platforms. The heuristic 'PDF_SEO_LINK_FARM' indicates a link farm, and the presence of a ClamAV detection for 'Pdf.Phishing.Trojan' strongly suggests malicious intent. The document body is heavily obfuscated and contains metadata from wkhtmltopdf, but the primary malicious activity appears to be the redirection to a network of SEO-optimized PDF links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://fokemale.ru/award?keyword=how+to+make+icf+coach PDF link annotation
    • http://kujunat.medianewsonline.com/how_to_clean_a_black_and_decker_dustbuster.pdfIn PDF document text
    • https://suxekupawuva.weebly.com/uploads/1/3/2/7/132710704/9738349.pdfIn PDF document text
    • https://cdn.sqhk.co/jasojime/fjfjgvX/nabiraxubewufaga.pdfIn PDF document text
    • https://pepulumowuso.weebly.com/uploads/1/3/2/6/132681954/8805952.pdfIn PDF document text
    • https://cdn.sqhk.co/metexemoraga/XzhfXhb/best_american_football_players_in_europe.pdfIn PDF document text
    • https://cdn.sqhk.co/buzaxelubot/Jv2ia8k/aliens_drive_me_crazy_mod_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455884/normal_6030a7093d23e.pdfIn PDF document text
    • https://vigoruso.weebly.com/uploads/1/3/4/1/134131386/0c41bd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485308/normal_5fe2ec1eedc08.pdfIn PDF document text
    • http://kolagozisil.mywebcommunity.org/how_to_be_a_good_pediatric_nurse.pdfIn PDF document text
    • https://cdn.sqhk.co/fekesolip/jdbjhT0/78027033899.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413967/normal_601b0bef541b7.pdfIn PDF document text
    • https://vagofavom.weebly.com/uploads/1/3/4/4/134486407/sadubupuliwir.pdfIn PDF document text
    • http://bimemonok.22web.org/do_dunkin_donuts_flavor_shots_have_sugar.pdfIn PDF document text
    • http://fofumumitem.medianewsonline.com/watemis.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383921/normal_6004f183371bf.pdfIn PDF document text
    • https://cdn.sqhk.co/xawobovuji/gcGib0b/chauvet_color_dash_par.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://vituzitozitu.epizy.com/zabewumarobo.pdfIn PDF document text
    • http://fibubaxuvuvixik.epizy.com/98389126034.pdfIn PDF document text
    • http://suvoxezol.rf.gd/wefogoguxokad.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010c26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C26 4616 bytes
SHA-256: f33421482e1ec09ffe938dccecf01d8d7bdb0d12d0e3685cedd0b20000943e0f
font_01_sfnt_off00011be9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BE9 10264 bytes
SHA-256: 8aacf9b108bd311aac53a10f61bb59049bf4333775db55f948424ac7d980b292
font_02_sfnt_off00013f02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F02 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333