Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cca50a48748f0bf…

MALICIOUS

PDF

67.0 KB Created: 2021-04-06 06:08:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 169d2c266700fe84006a76d2bfe52bb0 SHA-1: b45b3c76b3620d214b1641537444950c11fabc21 SHA-256: 5cca50a48748f0bfbe9de22ede06952b09c3a0a7fd2fe93e989b893ef8ec3efc
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, many of which are hosted on disposable domains or link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though heavily obfuscated, contains keywords related to a textbook solution manual, likely used as a lure to encourage users to click on the embedded malicious links.

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 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.
  • 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://vilenefex.ru/strik?utm_term=digital+signal+processing+proakis+4th+edition+solution+manual+pdf PDF link annotation
    • https://gusemotasejodab.weebly.com/uploads/1/3/2/7/132741535/gisixikefupedo_nonatewova_ledarufofolofut.pdfIn PDF document text
    • https://zopojidiluze.weebly.com/uploads/1/3/4/3/134361294/sasunapizove_mudosazomoreruw.pdfIn PDF document text
    • http://talebakela.iblogger.org/hindustani_classical_music_instrumental_free.pdfIn PDF document text
    • https://jijobowuzum.weebly.com/uploads/1/3/4/5/134590228/funokesetani.pdfIn PDF document text
    • https://mixifomako.weebly.com/uploads/1/3/1/1/131164472/rakeziwuparimamis.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xifenarubomes.rf.gd/biology_campbell_chapter_1.pdfIn PDF document text
    • https://s3.amazonaws.com/tujeviwakirawu/43831083711.pdfIn PDF document text
    • http://rejinivak.rf.gd/what_are_the_physical_requirements_to_join_the_army.pdfIn PDF document text
    • https://s3.amazonaws.com/mokuwanibof/36916134848.pdfIn PDF document text
    • https://s3.amazonaws.com/divelikubapiwaj/interrail_europe_travel_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/xisefowu/79656445855.pdfIn PDF document text
    • http://zoferuwarutor.epizy.com/17870342468.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e06d017-5cd6-4632-8ba0-4f22a415a0e2/words_related_to_stressed_out.pdfIn PDF document text
    • http://desujiruvomeb.myartsonline.com/jatejunalirijolivuzaluv.pdfIn PDF document text
    • http://baxazujokeranu.epizy.com/introductory_genetics_lecture_notes.pdfIn PDF document text
    • https://s3.amazonaws.com/ropidadegaxut/article_370_amendment_bill.pdfIn PDF document text
    • http://vopepogam.rf.gd/peripheral_route_persuasion_ap_psych.pdfIn PDF document text
    • http://xefiposokupama.myartsonline.com/canada_provinces_and_capitals_quiz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fce2667a-2bbc-40be-85df-f64eb73602a5/32513868111.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_off0000c756.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC756 5720 bytes
SHA-256: 4393ca4dd0451d5ef44644e93d2972c01e68e443943ae1cc6d3654d3cf09f5d0
font_01_sfnt_off0000dabc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDABC 10432 bytes
SHA-256: db12e7ebe26b2389a0472d47a80586d37962280b8e009d1f602b4506788da375

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