Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8168f51666dd87b…

MALICIOUS

PDF

75.4 KB Created: 2021-04-24 10:59:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: b1535dfca74e4e892a95d1897d763ddd SHA-1: 7691cfd68a553ca4ebe3bf6b7561515f8ef7f89e SHA-256: f8168f51666dd87b2c1aa25d201eb4471112987b016aa383d12e7e74b65459b5
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9997

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=homologous+analogous+and+vestigial+structures+worksheet+answer+key PDF link annotation
    • http://faceit.su/cumulative_frequency_graph_ggplot2wv80g.pdfIn PDF document text
    • http://wellwork.site/19865620129t1x5x.pdfIn PDF document text
    • http://priz24.site/28741458078akt0e.pdfIn PDF document text
    • http://kikifikoxije.mypressonline.com/kezepopopavupupu.pdfIn PDF document text
    • http://justiciaforjustice.com/pijegaksycb.pdfIn PDF document text
    • http://carinsusa.info/spectrum_math_workbook_grade_8_free92cvz.pdfIn PDF document text
    • http://mavpa.fun/karafun_player_25f3yy.pdfIn PDF document text
    • http://sokobumoxagug.scienceontheweb.net/50852712498.pdfIn PDF document text
    • http://fimokeroda.22web.org/35183981742.pdfIn PDF document text
    • http://superheatbelt.xyz/75698528667v8z3p.pdfIn PDF document text
    • http://levojefozaloro.mywebcommunity.org/zeledebafisifalazu.pdfIn PDF document text
    • http://xojanefod.mygamesonline.org/jotudevuxoxi.pdfIn PDF document text
    • http://hurricane1.space/650551112853j50.pdfIn PDF document text
    • http://fegivate.medianewsonline.com/nijapalegigi.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/f6ba77b5-d39c-4e76-bc99-20a922427661/bomutajowaz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9e14124-db85-4188-bc72-808bc073c34e/effective_communication_in_the_workplace_scholarly_articles.pdfIn PDF document text
    • http://kavuduvolilazod.myartsonline.com/mcgraw_hill_ebook_return_policy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67540597-0224-4ba9-b60b-fd9d28aff47e/bible_esv_free_download_android.pdfIn PDF document text
    • http://suxanovovogemi.rf.gd/59307899811.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/065e38ac-ea7e-49f6-98d6-9c5753cd9c1e/brother_cs6000i_sewing_machine_repair_manual.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_off0000dd05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD05 5516 bytes
SHA-256: a0989b2905cd5fbc83485ed345d8e2e7e104a7cdf41d4cee0524a6041a82e68c
font_01_sfnt_off0000efab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFAB 9928 bytes
SHA-256: 97c818981e8358750479fd1a1c439327af7d95a6ac82314e8b3bd0666df18370
font_02_sfnt_off000111cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111CC 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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