Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe0a10bf46df671c…

MALICIOUS

PDF

85.7 KB Created: 2021-04-07 06:17:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: cad49913d5e34de43f6d6dc8db8aa656 SHA-1: b1c94ff67bb751795db2919713740f2930ff6b4d SHA-256: fe0a10bf46df671ccad771be17070c8a19cf1fb8386825f6f6e64b9a15672d3d
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 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 0.9985

Heuristics 5

  • 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://fokemale.ru/award?keyword=cervidil+davis+drug+guide+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4410956/normal_6059c3e00efa3.pdfIn PDF document text
    • https://cdn.sqhk.co/sanojuxako/9geJhad/ios_simulator_for_windows_7_free.pdfIn PDF document text
    • https://wimiberurazem.weebly.com/uploads/1/3/4/3/134351881/7cf19c.pdfIn PDF document text
    • https://cdn.sqhk.co/wugunifikezu/Phfipia/zeseba.pdfIn PDF document text
    • https://cdn.sqhk.co/natefisaka/ggeClgc/calendar_september_2020_printable_colorful.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388162/normal_60639ff02700d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383798/normal_5fe940d8f37cc.pdfIn PDF document text
    • https://nobarikanu.weebly.com/uploads/1/3/1/4/131483152/novupetelivobes-wabepag.pdfIn PDF document text
    • https://cdn.sqhk.co/niririga/U2zjesv/nuditevat.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419640/normal_6047794eb5965.pdfIn PDF document text
    • https://cdn.sqhk.co/jowepotoxum/lvCEkih/bike_race_today_boulder.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://393102e6-89af-4738-8cad-89662dba8dc5.filesusr.com/ugd/33a16d_23f9a1c79a44425e84fe77a293cb3788.pdf?index=trueIn PDF document text
    • https://71f68c9c-1037-483c-a0ca-f268b7ddd3c8.filesusr.com/ugd/87fdc7_973e29737c52472f9d0872f63aae0712.pdf?index=trueIn PDF document text
    • https://e8b83640-91e4-44a0-a69f-c2468797902f.filesusr.com/ugd/ee4a13_964c894741e0496cbab18ce9d1d607dc.pdf?index=trueIn PDF document text
    • https://5a995288-ce6f-4ae3-a3e6-14272d8003db.filesusr.com/ugd/7be1cd_0d3a5b962ddc4e579d00729c00dabda3.pdf?index=trueIn PDF document text
    • https://1dfef493-bba3-4db0-89f7-7cef958ceea2.filesusr.com/ugd/3dbeb3_d02fdb7341ef46be96c02f2c501af857.pdf?index=trueIn PDF document text
    • https://bb74f61c-7045-47bf-9a7e-968101ee373e.filesusr.com/ugd/81ef4b_d03ffa7df85a4f6eafe98200c02ffe0d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/napoledunadigo/physiology_textbook_for_mbbs.pdfIn PDF document text
    • https://s3.amazonaws.com/dutimajizowa/25104470420.pdfIn PDF document text
    • https://6bc61794-ec17-45f1-96eb-8bed4cd57308.filesusr.com/ugd/217b8a_4f57d3112e524817badea6af8c26edb6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/purufiz/metformina_1000_mg_para_emagrecer.pdfIn PDF document text
    • https://3c4962d9-41f7-4f14-8396-dad57cc8de20.filesusr.com/ugd/a2de88_e468866312b945a4ab33455691bc9060.pdf?index=trueIn PDF document text
    • https://288c7b4b-0494-48f6-8ee2-9dd519b96b0a.filesusr.com/ugd/a107db_a2c4818286a943439dafcd64ee6450af.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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ede9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE9 4876 bytes
SHA-256: 7db0eafd419875b0243d89574e799c30cfc2da12fa975efec612e555d57b711c
font_01_sfnt_off0000fe99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE99 11088 bytes
SHA-256: f5a1dca74754045a17eb9a5a4530e02621647aee8a2b7dd47aeb10bbe206657d
font_02_sfnt_off00012488.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12488 16060 bytes
SHA-256: 5b0d2701ab39d2f69c66d7d16c60d8db0b323aa0832947137e757b5401d27330
font_03_sfnt_off00013920.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13920 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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