Malicious PDF — malware analysis report

Static analysis result for SHA-256 7586e4be65643844…

MALICIOUS

PDF

73.1 KB Created: 2021-03-27 11:48:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f11cb21d95732ab637799b956e83fddb SHA-1: 1c0f1667d00c3e3d5d84cbf2888e93601dbd6078 SHA-256: 7586e4be656438449eb1a1daddca2afd834b775bf9898dc4238e4adc847bd14c
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are obfuscated or lead to potentially malicious domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. The embedded URLs are likely used to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jacksth.ru/strik?utm_term=samsung+tv+does+not+have+hdmi+arc
    • https://cdn.sqhk.co/voxobidivel/jiHzSXY/flat_pack_kitchen_cabinets_south_africa.pdf
    • http://amst-watch-v1.club/vozodawoxilekofo8wcmv.pdf
    • https://zemedabumudog.weebly.com/uploads/1/3/2/7/132712209/wuzuxiti-fafoxupuxosovu-jebegorulebe.pdf
    • https://cdn-cms.f-static.net/uploads/4459470/normal_604677cedb828.pdf
    • https://cdn.sqhk.co/zogobadakedu/idggicX/18123568614.pdf
    • https://cdn-cms.f-static.net/uploads/4421039/normal_605ee2c4238d3.pdf
    • http://tryici.xyz/59025038180gkpen.pdf
    • http://pravagims.net/kutikosutavapuwekosfwr28.pdf
    • https://cdn.sqhk.co/tubadaluzafu/jchbJii/wusutibadoje.pdf
    • https://gokotaxoka.weebly.com/uploads/1/3/4/1/134109163/kosemawif.pdf
    • https://cdn.sqhk.co/dudosugebo/dpo9sna/grand_prix_story_apk_old_version.pdf
    • https://cdn.sqhk.co/kupovite/jcXhdQd/fadelafalekamirotu.pdf
    • http://bionatur.space/soxapinajapexiuiq77.pdf
    • https://cdn.sqhk.co/fexonawizoz/ifUi0hf/tikenijizijevutimewu.pdf
    • https://cdn.sqhk.co/wodelaganav/Tgjijd0/30566220576.pdf
    • http://plafond.xyz/troy_bilt_horse_xp_46_deck_belt_diagrame1thw.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://0c43c058-97b3-435a-b041-a9f001bfa883.filesusr.com/ugd/791d74_9694c6109642418eacca501efb1346f5.pdf?index=true
    • https://2c8134a4-d865-4da1-8961-c755d7242105.filesusr.com/ugd/6dcf04_7489e3d52ec540ddbf8116bb7bc62e8c.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e025.bin
8c5d333729b82375513fcb42577704e9badeed3ed09d630bb3b699fffb97279c
pdf-font-stream PDF embedded font (sfnt) at offset 0xE025 5484 bytes
font_01_sfnt_off0000f2a2.bin
5e8a01671649921f0d5fa6c1ada80b622cbd901e28969abf6030506237f71e13
pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A2 10852 bytes