Malicious PDF — malware analysis report

Static analysis result for SHA-256 896c757ac28a6c0d…

MALICIOUS

PDF

89.4 KB Created: 2021-05-30 11:32:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 26452252e920e019d28d9498351f256d SHA-1: 68d2c630ddd3784e9e3ae4c2240cf3f645a75e23 SHA-256: 896c757ac28a6c0dea23697299958230fd5c478d15554d33d28ee41a80e6cd27
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 hosted on disposable domains, indicating a link farm or phishing operation. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded URLs likely lead to further malicious content or phishing pages.

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://zajinet.ru/strik?utm_term=verbos+en+ingles+terminados+en+o+x+ch+sh PDF link annotation
    • https://jijubukaxujofi.weebly.com/uploads/1/3/4/8/134892288/3361341.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467306/normal_5fdea0e236e06.pdfIn PDF document text
    • https://depoferi.weebly.com/uploads/1/3/4/4/134445349/botibu_pataf.pdfIn PDF document text
    • https://xijoxipuxob.weebly.com/uploads/1/3/4/7/134704834/wapolotas_xuzibolemuj_sibinikusamivig.pdfIn PDF document text
    • https://nebakeji.weebly.com/uploads/1/3/4/6/134649015/setogoxu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385028/normal_5fcaca5d928af.pdfIn PDF document text
    • https://jubolovewo.weebly.com/uploads/1/3/1/4/131453214/virufi.pdfIn PDF document text
    • https://venolebibu.weebly.com/uploads/1/3/5/3/135348563/bogivijumuju-zazuwopil-pofijijowiluto-gekijabiseda.pdfIn PDF document text
    • https://bubafoxir.weebly.com/uploads/1/3/0/8/130874260/46d6bafdd668ac0.pdfIn PDF document text
    • https://mudodawi.weebly.com/uploads/1/3/4/6/134653299/dusiz-fivinanupilakuw-bezaxodukazuli-mawukexigisir.pdfIn PDF document text
    • https://jarajegixam.weebly.com/uploads/1/3/1/4/131437089/5505868.pdfIn PDF document text
    • https://terigemi.weebly.com/uploads/1/3/1/8/131856376/kuxopepazur.pdfIn PDF document text
    • https://vogemafebin.weebly.com/uploads/1/3/4/2/134235603/jarike.pdfIn PDF document text
    • https://gutamigev.weebly.com/uploads/1/3/1/1/131163772/2374055.pdfIn PDF document text
    • https://boginajidu.weebly.com/uploads/1/3/4/6/134693166/lixuxofakifimoz-rimolazabevo-raduwivirifu-vojogozetav.pdfIn PDF document text
    • https://lujogisuz.weebly.com/uploads/1/3/4/9/134904514/9e54ee8e08b77.pdfIn PDF document text
    • https://lapefobok.weebly.com/uploads/1/3/4/6/134663543/lenifuj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480895/normal_5fc7a0c80e206.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/8885b194-fd29-4078-b3fd-de3f3549d4a2/gujjubhai_the_great_movie_download_filmywap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6df22b19-a0d1-4813-9987-5ffb65301eb7/g_shock_5146_change_time.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/578183f3-47b0-44e5-9ba3-32a37e1a04cf/vuvilerunifu.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_off00011b42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B42 5524 bytes
SHA-256: 815bbd1011c5f8f26da0313f7c0de754be5ace2e88e526c77750d6276543ab08
font_01_sfnt_off00012de1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DE1 13064 bytes
SHA-256: 0da49d47103eea35b176a472bb63a1fec4a94b5a0ef714522ac99251919b17fd