Malicious PDF — malware analysis report

Static analysis result for SHA-256 db851342ed42bc88…

MALICIOUS

PDF

81.4 KB Created: 2021-04-11 08:12:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 1a32b3c5f1c0c27b068eada906b8296e SHA-1: 19ccf0802b426c3e9d8abd8e346da4b9bcacfaca SHA-256: db851342ed42bc88d46343b4b57e5f3f138a528682a5103230346e8809be6444
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jottigo.ru/strik?utm_term=how+to+release+medical+records+from+kaiser PDF link annotation
    • https://fixefukazadutux.weebly.com/uploads/1/3/1/6/131607703/43ae8b07cde1be.pdfIn PDF document text
    • http://catsism.com/zobiradizirujufoge9rap1.pdfIn PDF document text
    • https://nimediwajukijiz.weebly.com/uploads/1/3/4/5/134501673/refuvavekatot.pdfIn PDF document text
    • http://mihetos.xyz/27726927163vlycs.pdfIn PDF document text
    • https://wozukepob.weebly.com/uploads/1/3/4/0/134017809/zekapo.pdfIn PDF document text
    • https://cdn.sqhk.co/suxevevagova/rqHjbSI/47100314479.pdfIn PDF document text
    • https://cdn.sqhk.co/luwesefizi/jjgda8H/xetixob.pdfIn PDF document text
    • https://cdn.sqhk.co/sarunasol/vjjuPge/pakowabosefojoge.pdfIn PDF document text
    • http://vandify.com/skype_mobile_video_callf7oz6.pdfIn PDF document text
    • https://cdn.sqhk.co/wepigosogo/8gh6Pjj/dr._driving_2_pc_indir.pdfIn PDF document text
    • https://cdn.sqhk.co/zenetofuma/S4yJS8V/rapujozikiduvovedazutu.pdfIn PDF document text
    • https://cdn.sqhk.co/wepigosogo/gaenhgn/lugopibolaxakoto.pdfIn PDF document text
    • https://cdn.sqhk.co/nulegudup/IbAghHq/70026998331.pdfIn PDF document text
    • https://wilibuluso.weebly.com/uploads/1/3/6/0/136086636/dalesokakizewa-notosaxufuxa-bununalu-zerifoxuloje.pdfIn PDF document text
    • https://cdn.sqhk.co/soxobiwefili/Nhijjii/pirate_kings_mod_apk_2020.pdfIn PDF document text
    • https://fuvapevamasazu.weebly.com/uploads/1/3/4/5/134507747/jokobi.pdfIn PDF document text
    • https://cdn.sqhk.co/zuvaworizon/jhlhgnv/scrambled_word_game_online.pdfIn PDF document text
    • http://checkmyscore.info/hasnabad_7_days_weather_report22e3o.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE4D 5284 bytes
SHA-256: 44ece9b65f58fba73c4f9bf38d0a8523fa936a8c217ebfaf3225e38e84837819
font_01_sfnt_off0001103f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1103F 11200 bytes
SHA-256: 3a2d51bbe6dc699b00fb5674338b784bb75831d1c86e64351afbafdf542ddb7e

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