Malicious PDF — malware analysis report

Static analysis result for SHA-256 21185f73db1bba9e…

MALICIOUS

PDF

74.1 KB Created: 2021-02-14 19:50:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 6bfdc40b399e244304d3ac7f3b673f8d SHA-1: cf59e3cb568ec8e076ca12eee00d80bb1f2e08d7 SHA-256: 21185f73db1bba9ef2198aada4e2adc7a5c97dd87a03148fc571d8e67184b4e0
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. The document contains numerous external links, with one prominent URL suggesting a lure related to job searching. The presence of embedded URLs and the heuristic indicating a link farm on disposable hosting further support a malicious intent to redirect users to potentially harmful sites.

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://baarspo.ru/wb?keyword=performing%20arts%20jobs%20near%20me PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4451044/normal_5fe1ec107f8ab.pdfIn PDF document text
    • https://nisikigibifug.weebly.com/uploads/1/3/0/8/130813528/nekenazodere_lexotofeped_zebodewijerisi_bikavilel.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368999/normal_600d9309df4ab.pdfIn PDF document text
    • https://minetoleletumu.weebly.com/uploads/1/3/4/7/134767865/4238833ade0a88.pdfIn PDF document text
    • https://dikajumexuw.weebly.com/uploads/1/3/4/3/134324924/togidedevaraga.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414514/normal_602096ed91dbc.pdfIn PDF document text
    • https://cdn.sqhk.co/xezojutatow/jjvdgiw/t-_mobile_phones_for_seniors.pdfIn PDF document text
    • https://cdn.sqhk.co/xugosovemi/ygcbjfE/metal_slug_code_j_pc_download.pdfIn PDF document text
    • https://ralunudedosamot.weebly.com/uploads/1/3/4/8/134856058/2125147.pdfIn PDF document text
    • https://cdn.sqhk.co/gaxudofexal/eggwule/craigslist_atlanta_rent_to_own.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417118/normal_5fc7c7e07db41.pdfIn PDF document text
    • https://porovepo.weebly.com/uploads/1/3/4/5/134527374/ddecb635d9b31.pdfIn PDF document text
    • https://cdn.sqhk.co/xonafelog/hbsUjhJ/bounce_tales_original_apk.pdfIn PDF document text
    • https://bateworolod.weebly.com/uploads/1/3/4/3/134315912/7905500.pdfIn PDF document text
    • https://mimejomukokije.weebly.com/uploads/1/3/4/5/134510045/vuwapesunaxa-koxirovesofu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488102/normal_600b1429987f3.pdfIn PDF document text
    • https://bururinuriz.weebly.com/uploads/1/3/4/8/134882015/2415357.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/medaliwifufugel/yasin_sharif_gujarati.pdfIn PDF document text
    • https://s3.amazonaws.com/jumedemimo/travel_itinerary_template_word_free.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_off0000dc55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC55 3016 bytes
SHA-256: 3cec158b7b9b5797f0c9283f5c160005808321dce525ae2e1c4f56865d735d3e
font_01_sfnt_off0000e70e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE70E 5272 bytes
SHA-256: 67016c8f384b081cd7245c903cfd072a7809a8f295f35c6b2e5ef11a6c6cae57
font_02_sfnt_off0000f8e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E6 10012 bytes
SHA-256: 5badc516404b6de6e4a27dc7d07f0aa8d78d7c27da5daa16056c790aa8002531

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