Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bb0934b9040dfd2…

MALICIOUS

PDF

76.9 KB Created: 2021-05-13 01:24:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: c56cedae31ba1f4b6bf1f5b700329693 SHA-1: c410fa146542304e319d1169b13129314b2c5990 SHA-256: 3bb0934b9040dfd2a0e7618a5636ec837a4ecbb9ea6e1ed83857e21552fad6d3
126 Risk Score

Malware Insights

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

The PDF file contains multiple embedded URLs, with one prominent URL pointing to a domain associated with phishing lures. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded URIs suggest an attempt to redirect the user to a malicious site, potentially for credential harvesting or further payload delivery.

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://kuzutuzo.ru/strik?utm_term=can%2527t+connect+onn+bluetooth+headphones PDF link annotation
    • http://solapp.xyz/past_simple_present_perfect_song_worksheetbsjq2.pdfIn PDF document text
    • https://gujejedadun.weebly.com/uploads/1/3/1/3/131398181/vijuzido.pdfIn PDF document text
    • http://lumekosufanegu.iblogger.org/peter_atkins_chemistry.pdfIn PDF document text
    • https://bogezemobazuv.weebly.com/uploads/1/3/1/8/131856224/4090854.pdfIn PDF document text
    • http://gosoxegekiri.mywebcommunity.org/kenworth_t800_specs.pdfIn PDF document text
    • http://tavafotuzefox.sportsontheweb.net/navikomefonipalexeve.pdfIn PDF document text
    • http://masito.space/46817277711ilf5z.pdfIn PDF document text
    • http://bukenisefino.mygamesonline.org/cancer_de_pulmo_resumo.pdfIn PDF document text
    • http://sanamikegimelab.22web.org/fukenut.pdfIn PDF document text
    • https://likerediweraj.weebly.com/uploads/1/3/4/6/134691167/vifofujexakatis.pdfIn PDF document text
    • https://tezefidusipenu.weebly.com/uploads/1/3/1/8/131857758/6d9ee54a3ddd.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
    • http://duzesonugineku.rf.gd/niv_audio_bible_free_for_pc.pdfIn PDF document text
    • http://zogoxuf.atwebpages.com/kikekukunesopubos.pdfIn PDF document text
    • http://likitaponuviv.rf.gd/weather_report_for_mesa_arizona.pdfIn PDF document text
    • http://pikezega.epizy.com/177_mental_toughness_secrets_of_the_world_class_barnes_and_noble.pdfIn PDF document text
    • http://divakupi.rf.gd/vofivu.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_off0000e151.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE151 5096 bytes
SHA-256: 5ec34f4d618d2aaf55e5da42cfcf2fe663a80a1d69aad3cb3b7c48141a4b4e1f
font_01_sfnt_off0000f29b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF29B 11148 bytes
SHA-256: b93a12736a10762cd48b9ccf6d988634a33387c990c1b9ee9e5b20dc4d8fce14
font_02_sfnt_off00011818.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11818 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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