Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b1805a94f38b735…

MALICIOUS

PDF

75.7 KB Created: 2021-03-03 03:31:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: cf62be69204cdee4794f072d0973d58e SHA-1: 2416729fc22be6f50f47ea339c71fc65c5727b1c SHA-256: 2b1805a94f38b735d875e17326407c3f0d655894958f9eba1298555d9a562512
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDFs, suggesting a link farm designed to attract search engine traffic. One of the primary external links, https://mezovuduw.ru/123?utm_term=the+norton+anthology+of+american+literature+shorter+8th+edition+pdf, is suspicious and likely part of a phishing or malware distribution scheme. The presence of PDF_SEO_LINK_FARM and ML_NYX_PDF_MALICIOUS heuristics, along with ClamAV detection, strongly indicates malicious intent.

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://mezovuduw.ru/123?utm_term=the+norton+anthology+of+american+literature+shorter+8th+edition+pdf PDF link annotation
    • https://cdn.sqhk.co/gewanunu/jfigqKa/malituxopa.pdfIn PDF document text
    • http://siwupezomejen.getenjoyment.net/64251347071.pdfIn PDF document text
    • http://zaxevef.getenjoyment.net/jukuposunaletitidomor.pdfIn PDF document text
    • https://kakituku.weebly.com/uploads/1/3/4/5/134589995/fagojisemotijerano.pdfIn PDF document text
    • http://kezosod.iblogger.org/fimewebiziwogunijemix.pdfIn PDF document text
    • https://zififawatef.weebly.com/uploads/1/3/4/3/134384507/jakevavufuzotanite.pdfIn PDF document text
    • https://cdn.sqhk.co/xuwadezab/bz4JF5I/furia_de_titas_online_assistir.pdfIn PDF document text
    • https://cdn.sqhk.co/gaxokakijefe/hieTjga/exploration_worldcraft_miner_online.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xovajukoxin/1766385043.pdfIn PDF document text
    • http://vakizonozajaxe.onlinewebshop.net/jubuzixusoxob.pdfIn PDF document text
    • http://zotawof.rf.gd/is_headspace_guided_meditation_app_free.pdfIn PDF document text
    • https://s3.amazonaws.com/zodawanuror/girl_t_shirt_mockup_psd_free.pdfIn PDF document text
    • https://s3.amazonaws.com/tetenifeme/82024325965.pdfIn PDF document text
    • http://fopovixiwi.epizy.com/wutoraf.pdfIn PDF document text
    • https://s3.amazonaws.com/jazamerijekufol/chemistry_periodic_table_cheat_sheet.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_off0000e465.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE465 5812 bytes
SHA-256: 60f51cd390509344f372aa9897d04f8c0791f2a5c5c77830675b0a49664b8737
font_01_sfnt_off0000f812.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF812 12456 bytes
SHA-256: 7baa44d64151e30d17f87c9746517fa0eb5960e016b21bc42d41c8eb925ecbc7

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