Malicious PDF — malware analysis report

Static analysis result for SHA-256 504ea65774677445…

MALICIOUS

PDF

90.3 KB Created: 2021-04-27 18:47:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 832376707679cbfae0c3cf6b1e34a331 SHA-1: daa9caef4b097c3d8112261d3ddb01c61e25a079 SHA-256: 504ea65774677445caec942beb1cf247b5c4935a0db8a5da83b257b57d3d6c25
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://nipisod.ru/strik?utm_term=what+is+generation+computer+in+hindi+language PDF link annotation
    • http://helps-lnstagramcopyrights-about.com/58888343826ambps.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390057/normal_5fe7eb87ab90e.pdfIn PDF document text
    • http://nebuxopav.mypressonline.com/buffalo_wild_wings_nutrition_info.pdfIn PDF document text
    • http://dibiwarisogix.mygamesonline.org/hong_kong_disneyland_map_2020.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500444/normal_6050348d3aae5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426957/normal_5fd6a9eded183.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384459/normal_60322104c2e9b.pdfIn PDF document text
    • http://smilex.club/voyage_belek_fact_sheet_2019lzbds.pdfIn PDF document text
    • https://cdn.sqhk.co/didowolikex/bhbSheh/slippery_slides_australia.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423453/normal_6052fa83ae39f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477635/normal_604fe92299140.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365542/normal_5fee510cb5408.pdfIn PDF document text
    • https://cdn.sqhk.co/budajawisore/fiihchf/under_the_influence_book_summary.pdfIn PDF document text
    • https://cdn.sqhk.co/mezutorixo/hdOgjjd/87644474528.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381297/normal_5fe6a57f7a240.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/guxosa/lobusezelelibu.pdfIn PDF document text
    • http://nopugorib.onlinewebshop.net/45150859981.pdfIn PDF document text
    • https://s3.amazonaws.com/fosalizuzu/aurelina_dourado_musicas.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_off00011483.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11483 3088 bytes
SHA-256: 23767313774cc8dcc1f8ff5ed5165fdc2800ded0728e063be16a6d1a968622ec
font_01_sfnt_off00011f99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F99 5500 bytes
SHA-256: fe18488237516b2cbbe6a2c4e5f1eff5fb599f1e5b1b92a3fde937c53256c9e3
font_02_sfnt_off00013230.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13230 11564 bytes
SHA-256: b8c14ba6b6781dcfd5897058259b077262825cd5d87edef5ad69142b35b33084

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