Malicious PDF — malware analysis report

Static analysis result for SHA-256 a31c39b4fc7450a6…

MALICIOUS

PDF

90.3 KB Created: 2021-03-17 22:51:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: bacc9d75346d94802cb5f660eae8e172 SHA-1: dec5c63a08a7bf725efde18f446ec661cb5c8b9a SHA-256: a31c39b4fc7450a6eaf7f787878169381aac2d2f75b510823715f29f99be7234
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file contains a large number of external links, a common tactic for phishing or distributing malware. The heuristic 'PDF_SEO_LINK_FARM' indicates a deliberate attempt to create a link farm, with many links pointing to disposable hosting. The ClamAV detection and ML classifier further support its malicious nature, likely serving as a lure to redirect users to malicious sites.

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://fokemale.ru/aws?utm_term=is+kaplan+dat+course+worth+it PDF link annotation
    • https://gekubuneka.weebly.com/uploads/1/3/4/0/134041200/remadibekelu.pdfIn PDF document text
    • https://sumulepali.weebly.com/uploads/1/3/4/8/134882140/xubepunur.pdfIn PDF document text
    • https://cdn.sqhk.co/wuwovodegi/ghChhkX/brateck_essential_dual_monitor_desktop_stand_ldt08-_t02.pdfIn PDF document text
    • https://cdn.sqhk.co/jotepomi/cvrhejj/stickman_doing_karate.pdfIn PDF document text
    • https://cdn.sqhk.co/narulaloro/hdgiVCd/fevuwevatagejipakipano.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473638/normal_6040dcc87c9c3.pdfIn PDF document text
    • https://zawivipesanupi.weebly.com/uploads/1/3/4/7/134724715/2766105.pdfIn PDF document text
    • http://tuvosudokalidu.scienceontheweb.net/85165645126.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403408/normal_602e52dd2056f.pdfIn PDF document text
    • https://cdn.sqhk.co/wazilisiko/igjfGhh/expression_of_interest_job_template.pdfIn PDF document text
    • https://fivubiforozoxi.weebly.com/uploads/1/3/4/6/134676017/fesazusewepakab.pdfIn PDF document text
    • https://bevereka.weebly.com/uploads/1/3/0/7/130739533/xawiviret.pdfIn PDF document text
    • http://mujezinej.22web.org/accu_chek_aviva_nano_user_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/xusarukave/9sVgdii/tree_template_without_leaves.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494429/normal_6017b701beb5e.pdfIn PDF document text
    • https://noromilo.weebly.com/uploads/1/3/4/5/134587763/5804379.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471467/normal_5fec00012a6bc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zizenatoxu.myartsonline.com/psychrometric_chart_celsius.pdfIn PDF document text
    • http://litorow.myartsonline.com/77149743811.pdfIn PDF document text
    • http://wizigipixe.atwebpages.com/99750489667.pdfIn PDF document text
    • http://kirigawegugava.epizy.com/cara_bookmark_online.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010dd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DD0 5256 bytes
SHA-256: 048853d3f8be8b60e6c584d17d968147c7bc61bfd6af92363019d7a14fb675ec
font_01_sfnt_off00011fbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FBE 10924 bytes
SHA-256: 35ad6980b28df74935814334cd0531cefc6e0f53f6c62fd4ceed30ca8e525698
font_02_sfnt_off00014509.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14509 16092 bytes
SHA-256: ea75db71c9df7250347a03039f742fcd189f5fc3f08964e696816fa8b5227073