Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3e923836a11e375…

MALICIOUS

PDF

83.2 KB Created: 2021-04-04 07:17:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 4af3c453b3fa6ddbf710724557cdbbae SHA-1: 16444a13a41a3c2e8a42b94a140b649c221a4577 SHA-256: b3e923836a11e375627c18bea813442dd7411e20ab1d015801d68ceeb2c5afb3
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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.
  • 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://nipisod.ru/strik?utm_term=how+to+install+a+samsung+dishwasher+dw80f600uts PDF link annotation
    • https://cdn.sqhk.co/poxofufiko/djeBjfd/midajuforuzexerozijibed.pdfIn PDF document text
    • https://cdn.sqhk.co/mezutorixo/bLMrxgd/bubble_tea_game_free_download.pdfIn PDF document text
    • https://zuwexonoporij.weebly.com/uploads/1/3/5/3/135317719/witudanixoripobekap.pdfIn PDF document text
    • https://cdn.sqhk.co/vexavudakepa/ffKxgiK/minecraft_pe_for_pc_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/tibidimewako/gid4ieG/61388488576.pdfIn PDF document text
    • https://gumomerad.weebly.com/uploads/1/3/1/8/131856086/7437211.pdfIn PDF document text
    • http://bit7.top/how_to_textual_analysiszue3t.pdfIn PDF document text
    • https://jimamejovegevag.weebly.com/uploads/1/3/4/5/134593921/ea1d1321.pdfIn PDF document text
    • https://dibotora.weebly.com/uploads/1/3/4/8/134870334/malazidogu.pdfIn PDF document text
    • https://lotigasi.weebly.com/uploads/1/3/4/7/134705720/sodogekinajuzulud.pdfIn PDF document text
    • http://ig-socialmedia.xyz/general_chemistry_lab_manual_answers_hayden_mcneilcrx1h.pdfIn PDF document text
    • http://blue-tick-central.com/paracord_knife_wrapsbf66y.pdfIn PDF document text
    • https://ligonulijer.weebly.com/uploads/1/3/5/3/135318365/tadasojewajexitoj.pdfIn PDF document text
    • https://cdn.sqhk.co/xeloxilava/OTbxhiG/marooned_meaning_examples.pdfIn PDF document text
    • https://pumewigegokofav.weebly.com/uploads/1/3/4/3/134317234/6253459.pdfIn PDF document text
    • https://falifutupinafef.weebly.com/uploads/1/3/4/3/134318839/164569.pdfIn PDF document text
    • http://milanbeach.fun/under_the_dome_season_2_episode_6_watch_online_freesbbrm.pdfIn PDF document text
    • https://tabuwesajusa.weebly.com/uploads/1/3/1/8/131856124/vofoto_nejidijowegiju.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/3ffbd38e-c770-465a-96cc-cef96e0e82fa/how_to_apply_3m_film.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23454797-a106-4278-b0a8-bcf236e04575/is_braava_m6_worth_it.pdfIn PDF document text
    • https://s3.amazonaws.com/mamibis/14744538736.pdfIn PDF document text
    • https://s3.amazonaws.com/tojabixefova/backup_exec_job_history_report.pdfIn PDF document text
    • https://s3.amazonaws.com/wivunonovef/33710205726.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2db81eb8-7af3-499a-995d-874c32279c57/45111821544.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_off0001068f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1068F 5864 bytes
SHA-256: 41d474398a92a1bfc52b97bd09bce17ff5ab878b882b47a560e8284265ace7c6
font_01_sfnt_off00011a61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A61 10776 bytes
SHA-256: a6ba79a0bdb84c8bd00b85c831138fbc10883df07fd71af2159d6bbbecc47521