Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b5b0c56d26bd34c…

MALICIOUS

PDF

69.7 KB Created: 2021-03-24 23:55:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 6774c8328fb2f6c3304407ef857f27f1 SHA-1: bff65441a5bae5af0d80f1d96ee6b8977dd1c4ca SHA-256: 4b5b0c56d26bd34c143291b28c59b1f48f5565f32c13c20485bb7eb95af717ec
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic analysis identified external URIs and classified the PDF as a link farm on disposable hosting, suggesting a phishing or malware distribution lure. The embedded URL `https://jacksth.ru/strik?utm_term=2011+rav4+for+sale` is the primary IOC, likely leading to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jacksth.ru/strik?utm_term=2011+rav4+for+sale PDF link annotation
    • https://buderenedisam.weebly.com/uploads/1/3/5/3/135302361/ketetavaruxe_jitimomubazixo_dagam_ganivib.pdfIn PDF document text
    • http://raisinshub.club/vocabulary_workshop_level_b_unit_10-12_word_study_answersdeq7d.pdfIn PDF document text
    • http://kogutojoveso.mywebcommunity.org/81724109788.pdfIn PDF document text
    • http://lowusonuraku.mygamesonline.org/herbs_and_spices_uses.pdfIn PDF document text
    • http://susekilimu.medianewsonline.com/anemia_en_nios_oms.pdfIn PDF document text
    • http://doucheop.xyz/67350365010vi7ci.pdfIn PDF document text
    • http://idealicaitalia-ufficiale.site/990155315ik3wf.pdfIn PDF document text
    • https://paboripiniw.weebly.com/uploads/1/3/0/7/130739049/zakufexubilowep_kobogebaz_sogozag_lotexiwexes.pdfIn PDF document text
    • http://instapriz24.online/keranoclilf.pdfIn PDF document text
    • http://euroshopmn.space/redhead_safe_weightedc2k.pdfIn PDF document text
    • http://tixshopclub.fun/spring_4_tutorial_journaldeveeft6.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/e5c09884-e672-45b2-b1bd-8a71d41eaf8d/12928467246.pdfIn PDF document text
    • http://jukasuxoseki.atwebpages.com/britax_advocate_clicktight_arb_installation.pdfIn PDF document text
    • https://s3.amazonaws.com/minabiwa/pilijajovobudanojugu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/534618e5-6f02-49b9-9255-7caea6080ead/69926886850.pdfIn PDF document text
    • http://kaloruligot.onlinewebshop.net/can_you_harden_304_stainless_steel.pdfIn PDF document text
    • https://s3.amazonaws.com/pobixedele/buvetujozowedoxof.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5105fb9e-f6a9-45b2-8acb-cbe81149817d/2003_ford_focus_battery_cable_replacement.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ad15ecb-4a13-4c13-a954-4624880eb96a/paxinivomijizux.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_off0000d2be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2BE 5140 bytes
SHA-256: eaf54dc0500bf46152328fd7915ef1d46969ccbf3f08e436b55b282ead0b0dcd
font_01_sfnt_off0000e45a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE45A 11492 bytes
SHA-256: 450f9e7aae5987e671bff54539ba0042a368f2beb91daf2df1a6c66c81d64bb1

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