Malicious PDF — malware analysis report

Static analysis result for SHA-256 16fd1ddd2f76a649…

MALICIOUS

PDF

87.3 KB Created: 2021-03-30 23:26:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 9b743da285b1ce66454ace4af7e3a314 SHA-1: 2f4a9d6bd933305cb9bdfaa8ab66938d0cc00719 SHA-256: 16fd1ddd2f76a6493032912196e25166ae09f316fa2a14fa295408981885b21d
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and a high ML score indicating malicious intent. The document body, though heavily obfuscated, suggests a lure related to self-defense, which is likely a pretext to drive users to malicious sites. The presence of external URIs and link farm heuristics further supports a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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=how+to+defend+myself+in+a+street+fight PDF link annotation
    • http://new-leggins.site/37186852357dld9p.pdfIn PDF document text
    • http://lonotel.mygamesonline.org/pudodezijoforabixin.pdfIn PDF document text
    • http://grinallex.shop/fefinelovutevejuzomogjhk16.pdfIn PDF document text
    • https://cdn.sqhk.co/pesegozod/jjdhhAN/funny_gift_ideas_for_guy_friends.pdfIn PDF document text
    • https://cdn.sqhk.co/susiwebuvowo/k6hiiKh/16976333044.pdfIn PDF document text
    • http://sugameloxufe.mywebcommunity.org/place_value_worksheets_grade_5_cbse.pdfIn PDF document text
    • http://gatowixipeba.mywebcommunity.org/37317708485.pdfIn PDF document text
    • http://pejokepi.mywebcommunity.org/whirlpool_top_load_washer_troubleshooting.pdfIn PDF document text
    • https://cdn.sqhk.co/vidoperife/dMife6P/racing_go_kart_engines.pdfIn PDF document text
    • http://italiahot.space/ravens_steelers_2020_ticketszd1kk.pdfIn PDF document text
    • https://cdn.sqhk.co/fuluzagile/QNHiiii/gusuwapokelinuw.pdfIn PDF document text
    • http://zajiledafalam.getenjoyment.net/gudagesasiwozu.pdfIn PDF document text
    • http://jewlgems.com/fadawuguip.pdfIn PDF document text
    • http://liwexun.mywebcommunity.org/estoy_cansado_anselm_grun.pdfIn PDF document text
    • http://nafarami.medianewsonline.com/musodobuzexemukopor.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/0b2a8327-0862-497f-a373-1336c09bd94b/7196836774.pdfIn PDF document text
    • http://rizukapusapanom.rf.gd/pradeep_biology_class_10.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f761092-7e75-476d-a7d3-09c1f67b692a/55903729507.pdfIn PDF document text
    • http://diwedixeku.rf.gd/xujukawifit.pdfIn PDF document text
    • http://wereguvepowu.epizy.com/kekalamaxebozilitanuzezip.pdfIn PDF document text
    • http://fenulujexita.epizy.com/crohn_disease_guideline.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_off00010a03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A03 5264 bytes
SHA-256: 3584b6c559adef8c2d6975ffb3885eaf3a1078f470de43f8f2c436b46fa1d988
font_01_sfnt_off00011bc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BC8 10904 bytes
SHA-256: 70055ae19fa0108be226787fa2e9a4bfceb5bc204b48fdc029524ca91b2c6041
font_02_sfnt_off00014113.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14113 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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