Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf4aa45e0c1bc5a0…

MALICIOUS

PDF

79.0 KB Created: 2021-06-07 01:56:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 8f0ebe916d5e464fd9b64d2be6a45043 SHA-1: e96d1cd1bfe6fb9750149d796e97df51cfca0c33 SHA-256: cf4aa45e0c1bc5a08d308eff8830523a61b30cb77495caa0e6f6983b5dd77ff2
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 0.9995

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://inwebjor.ru/pbw?utm_term=dream+league+soccer+2021+t%25C3%25BCrk%25C3%25A7e+spiker+nas%25C4%25B1l+yap%25C4%25B1l%25C4%25B1r PDF link annotation
    • https://woxuxafo.weebly.com/uploads/1/3/4/6/134652349/tejine.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486997/normal_602a8b68d958d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379362/normal_601287efb9819.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415327/normal_60180775347f0.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4463794/normal_60b555db6ee27.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407729/normal_600a9afff045a.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4471941/normal_60b2ee075bf57.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418786/normal_5fe46f0d96be7.pdfIn PDF document text
    • https://gebomatera.weebly.com/uploads/1/3/5/3/135396668/5600471.pdfIn PDF document text
    • https://jatilupek.weebly.com/uploads/1/3/4/4/134491857/vodugunevub.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4404490/normal_60b358d4aa5d5.pdfIn PDF document text
    • https://senemoribut.weebly.com/uploads/1/3/4/7/134703027/80a7e0080a72336.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470385/normal_604d9d105c40a.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/ac34d89a-0720-48a6-a8ea-c33e89ff0426/polelilenurazovogogix.pdfIn PDF document text
    • http://pezeliv.pbworks.com/w/file/fetch/144426630/22785686600.pdfIn PDF document text
    • http://runaliguredu.pbworks.com/w/file/fetch/144475629/gidupova.pdfIn PDF document text
    • http://nomebazeregi.pbworks.com/w/file/fetch/144705216/jobozebibawosuvexopit.pdfIn PDF document text
    • http://xuresasadox.pbworks.com/f/is_lady_macbeth_evil_quotes.pdfIn PDF document text
    • http://lugozamuxika.pbworks.com/f/how_to_get_25_000_robux_for_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dabfe950-a3da-421e-9c8c-e746d816ccd5/cant_remove_anode_rod_from_water_heater.pdfIn PDF document text
    • http://malamojozag.pbworks.com/w/file/fetch/144685467/16111424953.pdfIn PDF document text
    • http://sekodegaxex.pbworks.com/f/86841156823.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_off0000e4a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4A5 5960 bytes
SHA-256: a99d9caef03770896831661f7fc4a27e92620746258b345a31bd72ee7b611718
font_01_sfnt_off0000f873.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF873 11364 bytes
SHA-256: e1d40847cff2103457d4c88557dfbc6bb4c5b9aaae292ccd25bf5e247e1fd7b5
font_02_sfnt_off00011d60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D60 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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