Malicious PDF — malware analysis report

Static analysis result for SHA-256 50cc30a3b09cfed7…

MALICIOUS

PDF

117.1 KB Created: 2021-03-13 17:03:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 05490608f8927ee4f7a86ebf5e0d028f SHA-1: ebff0aa819ca0dd18a2415553902ad3e7aceae5a SHA-256: 50cc30a3b09cfed704ba0679b2388b9f671d22c6c01b8b9c41f0627f0f6ab59a
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution via these links. No scripts were extracted, but the PDF structure itself is indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://jacksth.ru/award?keyword=le+bourgeois+gentilhomme+%25D8%25A8%25D8%25A7%25D9%2584%25D8%25B9%25D8%25B1%25D8%25A8%25D9%258A%25D8%25A9+pdf PDF link annotation
    • https://niwanuve.weebly.com/uploads/1/3/1/4/131406473/74d6e333.pdfIn PDF document text
    • https://sevokubataper.weebly.com/uploads/1/3/0/8/130814346/64e14d14a4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420037/normal_604cb6bb7301d.pdfIn PDF document text
    • https://talowitutujuf.weebly.com/uploads/1/3/3/9/133999148/xukovul-kizapelogola-pepowubul-nusole.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485587/normal_6037154b26a3f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393506/normal_5ff03f369e9ab.pdfIn PDF document text
    • https://karojigulad.weebly.com/uploads/1/3/4/6/134623473/gujokofewopudarito.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455639/normal_6016fece2bf60.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://db6d201d-bdff-4648-9982-d9cfaac7639e.filesusr.com/ugd/98857b_5bdc45c895b842fa94761a181e9daa3d.pdf?index=trueIn PDF document text
    • http://lovurezis.rf.gd/how_to_fix_stuck_sewing_machine.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/705bf50f-738f-4661-b2b6-5b468acc3201/johnny_cash_feat._u2-_the_wanderer_lyrics.pdfIn PDF document text
    • http://kugunimekuxaf.epizy.com/free_flyer_templates_for_small_business.pdfIn PDF document text
    • http://piredesoki.epizy.com/98373464182.pdfIn PDF document text
    • http://jizemefuzix.epizy.com/nutofirozexe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cac80495-3ed1-401a-bc40-cfe11398c359/fogelop.pdfIn PDF document text
    • https://s3.amazonaws.com/tutasujal/bubble_sheet_generator_free.pdfIn PDF document text
    • https://s3.amazonaws.com/numegubowalonan/70869418067.pdfIn PDF document text
    • https://s3.amazonaws.com/pirosisob/gukuvadenasuw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f8ba4ec-a4ca-4e86-b294-a096e5bfe095/nojozosigudobefi.pdfIn PDF document text
    • https://37991ae0-d72b-4ccf-bf90-288dedd591e7.filesusr.com/ugd/041b56_e7105a416a244fc683c265e4a3db3ca5.pdf?index=trueIn PDF document text
    • http://tijunejo.epizy.com/dapejagamemokezivozike.pdfIn PDF document text
    • https://13a7c488-548c-4b48-b567-d2b0b9a3e1de.filesusr.com/ugd/85d67f_9f3bdc775f434c1a836bc73b27efd5cf.pdf?index=trueIn PDF document text
    • https://6184de0c-c318-42a7-882e-c5ddc63b817d.filesusr.com/ugd/1c8c1e_92feaef0d35f4c53a7ba2880fe032ce2.pdf?index=trueIn 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off000189fc.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x189FC 32996 bytes
SHA-256: 4ffc59ab521f30d5b5dd9758be09ca9b6bde058fcccbd05dd57dcb6d3805fe8a
font_00_sfnt_off00013ee9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EE9 5328 bytes
SHA-256: 71927150dad58dc988de5e7f887afa0874600c9d79674654a5a39f39d0a4a505
font_01_sfnt_off000150d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150D9 9828 bytes
SHA-256: 051077c3318199c13f690b59a4ce05a8b1ca8090da6845c029b1f885be6533fe
font_02_sfnt_off00017294.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17294 16748 bytes
SHA-256: 568d1be931aae357e7dfab51641bb5bde9a88073785c613b79ce19ed239f8bfb

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