Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca5d53cbafdb49b8…

MALICIOUS

PDF

80.6 KB Created: 2021-04-09 09:45:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 50203ff87bf177de3152035f13c9c57b SHA-1: 416d5ea697dc7e0ca556550340330bb762fd1164 SHA-256: ca5d53cbafdb49b88f8c5230b7b9e725c53d4f4b3d353a4d0f14275eae763c3e
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are likely part of a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body, though heavily obfuscated, contains a search query that may be used to disguise the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://xezojetit.ru/strik?utm_term=percy+jackson+the+titan%2527s+curse+movie+cast PDF link annotation
    • http://inostrana.com/xijavagimujelotinojetovahk1o.pdfIn PDF document text
    • http://harkateine.fun/91991576417btn7s.pdfIn PDF document text
    • http://fenellalucynelle.info/zodajalijunujozedekuduvat28e9r.pdfIn PDF document text
    • http://birjand.design/chopin_sheet_music_preludeb12c0.pdfIn PDF document text
    • http://mini-cam2.club/15037617146dder.pdfIn PDF document text
    • http://opsnatur.fun/thompson_center_hawken_54_cal85rlj.pdfIn PDF document text
    • https://dezamemev.weebly.com/uploads/1/3/4/7/134746632/vawumapaxof.pdfIn PDF document text
    • https://zobojosapez.weebly.com/uploads/1/3/1/4/131483592/tojobol-zunobo-botawaj-sibifevalo.pdfIn PDF document text
    • https://jufesuzukexo.weebly.com/uploads/1/3/5/2/135294717/dolif-gejutexudini-gepitadukiri.pdfIn PDF document text
    • http://ygrash.website/vewetoxli5x7.pdfIn PDF document text
    • http://matras-24.ru/baldurs_gate_2_enhanced_edition_dual_class_guidewpsr3.pdfIn PDF document text
    • http://carishr.com/eu_flight_compensation_letter_templatehotmm.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495684/normal_5feb044e6b6d9.pdfIn PDF document text
    • https://musopikulaw.weebly.com/uploads/1/3/4/8/134851971/4c851ff8a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416139/normal_601b1e30bcf25.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/bbbed85f-1297-4627-85fe-5545ab2b2bba/samsung_tv_customer_care_number_bhubaneswar.pdfIn PDF document text
    • http://xuzinom.epizy.com/dentsply_cavitron_inserts_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1886fa88-be4d-43fb-a6b1-6213976f8b29/8843967877.pdfIn PDF document text
    • http://pubitawiwinas.rf.gd/waverley_christian_college_uniform.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/106e66e1-5216-458d-80fa-73b6d4e0c400/bubobasipotazan.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eeeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEEB 5228 bytes
SHA-256: f53a08133246f35298f3b848321c087b650006778164cbd08bc492887d360478
font_01_sfnt_off00010097.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10097 11400 bytes
SHA-256: 05d36c3853926fa79ad2864232fd5aff3bcd596a3fe9c5b81d556f676df6c9dd
font_02_sfnt_off000126e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126E9 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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