Malicious PDF — malware analysis report

Static analysis result for SHA-256 846f1023fe181187…

MALICIOUS

PDF

76.2 KB Created: 2021-03-13 15:23:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 6ffdc4a0f94be4a9952ca2a8680fce7f SHA-1: 15a373d7363162de570dd3b6bb0bdca777216ff2 SHA-256: 846f1023fe18118774315d5239b9e3550562b47c2da78736b29b303f103201df
186 Risk Score

Malware Insights

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

This PDF document functions as a link farm, directing users to various external PDF files hosted on disposable domains, likely to distribute malware or facilitate phishing. The primary lure appears to be 'Zarchiver apk download for pc', suggesting a deceptive attempt to trick users into downloading malicious software. The ML classifier and ClamAV detection strongly indicate malicious intent.

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://maypoin.ru/wix?keyword=zarchiver+apk+download+for+pc PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4405208/normal_5fd993f31357b.pdfIn PDF document text
    • https://zagemixawidi.weebly.com/uploads/1/3/1/3/131378918/getetupisemu.pdfIn PDF document text
    • https://guxesawaxogego.weebly.com/uploads/1/3/4/3/134314991/9522612.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457881/normal_60222a9c7158a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491936/normal_5fd11549a273b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480582/normal_5fcb70b4ac338.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388824/normal_60364d1d6b929.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491670/normal_601fa87168faf.pdfIn PDF document text
    • https://cdn.sqhk.co/pijajawopoji/U4eajbL/31409964445.pdfIn PDF document text
    • https://cdn.sqhk.co/zufosupiz/Cqyvihy/references_examples_in_apa_format.pdfIn PDF document text
    • https://jedadizonavo.weebly.com/uploads/1/3/4/7/134721040/9312637.pdfIn PDF document text
    • https://simebofes.weebly.com/uploads/1/3/1/4/131438459/moniluxexosaku-watige-bibakijov-bilef.pdfIn PDF document text
    • https://ligapixoxos.weebly.com/uploads/1/3/4/3/134378271/xorowezanajok-vowik.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365576/normal_5fdec89421d3d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459036/normal_5ffe84c6422bc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495531/normal_5fdc7b366cd9b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419195/normal_5febd12ae76d6.pdfIn PDF document text
    • https://nikizatul.weebly.com/uploads/1/3/5/3/135309179/19299.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387715/normal_602219ed7bcbf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377391/normal_6005519d97a6e.pdfIn PDF document text
    • https://cdn.sqhk.co/gopuxipo/3iaEkjj/car_performance_meter_speedometer_gauges_with_gps.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000ea56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA56 5236 bytes
SHA-256: acc74f64d7fc92adfd3373ee39334888d305521fbec2d1bfe83de1d9274ed52b
font_01_sfnt_off0000fc3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC3C 10892 bytes
SHA-256: 8678a6b21f88259ac89a01e46364a5404599ff53f28429b6dddecd80625d2284