Malicious PDF — malware analysis report

Static analysis result for SHA-256 b18f518fe73c7152…

MALICIOUS

PDF

78.0 KB Created: 2021-04-03 03:49:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: f41233ef31a5b74245ada9f9948cf7f9 SHA-1: 87a4c3a59041b5bbca20754918f07d0f142840a8 SHA-256: b18f518fe73c71529b41004bbff1e1eebe1333b5a3129ca3874c880b9020c60f
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting services, suggesting a link farm designed to redirect users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, potentially leveraging embedded JavaScript for malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://kuzutuzo.ru/strik?utm_term=how+to+do+trivia+online PDF link annotation
    • https://nizevamil.weebly.com/uploads/1/3/2/8/132814567/levoli.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451755/normal_5fde73208901b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408479/normal_5fef485a63ea6.pdfIn PDF document text
    • https://vunisanelebori.weebly.com/uploads/1/3/3/9/133999195/7407263.pdfIn PDF document text
    • https://vorebalulu.weebly.com/uploads/1/3/5/9/135962534/6585318.pdfIn PDF document text
    • https://tuwazumabokanif.weebly.com/uploads/1/3/4/6/134611666/a14f486c.pdfIn PDF document text
    • https://mesubepivugegej.weebly.com/uploads/1/3/2/6/132682347/gujiradurutabema.pdfIn PDF document text
    • https://denuxikunoleluj.weebly.com/uploads/1/3/4/0/134018299/xaxegopon.pdfIn PDF document text
    • https://zotabuja.weebly.com/uploads/1/3/4/5/134510490/domufepojezimal_temexuxat.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415740/normal_602b3e60418f1.pdfIn PDF document text
    • https://xirovule.weebly.com/uploads/1/3/4/7/134749068/xagel-wuwafokuluj-vetuvukigidup-xivijujimosu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451227/normal_5fe8f7a09f5a5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379231/normal_604e9944e472d.pdfIn PDF document text
    • https://megevoweroke.weebly.com/uploads/1/3/5/3/135351245/f28f25e63.pdfIn PDF document text
    • https://gamevuwi.weebly.com/uploads/1/3/4/5/134525912/xuwujuz.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/bulujono/brawl_stars_update_2019_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/mixanaz/how_to_put_money_on_prepaid_visa_card.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b2aefc2-1b5f-40a3-9ae6-29b9e9dfb8ef/can_multiple_macs_backup_to_time_capsule.pdfIn PDF document text
    • https://s3.amazonaws.com/sefiwegegagu/31197952131.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fffdf402-aee9-4cf8-b4a9-718f30fea70b/jijatamexaliga.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57615526-3f9c-4cb2-92b7-011d62ad37ff/toyota_highlander_hybrid_battery_life.pdfIn PDF document text
    • https://s3.amazonaws.com/zuguvoxoki/logitech_g900_wireless_adapter.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1219b10c-c22f-45b1-9fe8-88656d803430/gonibudijavow.pdfIn PDF document text
    • https://s3.amazonaws.com/dinigugaxej/fesopipewivewe.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_off0000f525.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF525 4756 bytes
SHA-256: c537606d8eef0942eedda8b3fd59b69827e1f483b6ecb368824127e8976b9560
font_01_sfnt_off00010570.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10570 11012 bytes
SHA-256: 430ca9cdbc633f8d22c69eacfaad6002e0e095bc93e0b740e2eeecb4d8ac2635