Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccd28cb55f51764d…

MALICIOUS

PDF

79.8 KB Created: 2021-04-04 00:37:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 06d197e954b81fdf60c1e8ff5e27555e SHA-1: b959a614056b6a413e5066565989905b1ec60503 SHA-256: ccd28cb55f51764d9d994777ca768de8b705608e376ee15fd03810de43aefef7
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a link farm, with the primary lure being a "shutter speed cheat sheet pdf". The ML classifier and ClamAV detection strongly indicate maliciousness. While no scripts were explicitly extracted, the PDF structure and link farm suggest an attempt to redirect users to potentially malicious sites, likely for phishing or SEO spam.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://druttle.ru/award?keyword=shutter+speed+cheat+sheet+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4458428/normal_602bab33a2e59.pdfIn PDF document text
    • https://gizetaxawu.weebly.com/uploads/1/3/1/8/131871526/6325858.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499319/normal_600ea036dfcbe.pdfIn PDF document text
    • http://modozadubop.mywebcommunity.org/leica_m6_for_sale_australia.pdfIn PDF document text
    • http://botanilix.mygamesonline.org/tumaczenie_fragmentw_zda_angielski.pdfIn PDF document text
    • https://takokapaxuv.weebly.com/uploads/1/3/0/9/130968961/sevanomorowuvuvida.pdfIn PDF document text
    • http://sarupunojupud.sportsontheweb.net/bertrand_russell_religion_y_ciencia.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425514/normal_600317f9e92f2.pdfIn PDF document text
    • https://sasanufodokedu.weebly.com/uploads/1/3/0/9/130969760/lugaxareji-doguki-vojesilu-sekabibisadolev.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490250/normal_6059226f3f14b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6ce95562-7558-49ee-a7b0-b3003db3b0e9.filesusr.com/ugd/d13e1f_6018383e27334aaea3563ac95cf7d3d1.pdf?index=trueIn PDF document text
    • http://vujijemu.atwebpages.com/30725983671.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18b15c01-469f-421a-aec2-188cf2557897/dewalt_dw713_10-inch_compound_miter_saw_reviews.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f68fb2fc-c109-4b6d-9500-c2bd31a7ba81/twilight_2008_hindi_dubbed_download_720p.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6d1eda0-cbbe-4f9f-9a39-3275273dab49/12581131923.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60a8eb80-219f-48fe-8287-5095484deead/dibujos_de_caras_tristes_y_alegres.pdfIn PDF document text
    • https://0f0532cb-4478-41f9-91a1-cf277c4732ec.filesusr.com/ugd/8acad3_d8231f121f3c43d2ad536c0722599f31.pdf?index=trueIn PDF document text
    • https://a62e46b8-d933-4087-892c-e5439cec6991.filesusr.com/ugd/e9cba9_2c0a0dd7193c470ea3d98643cc841064.pdf?index=trueIn PDF document text
    • https://9d3edb37-11ce-4d87-b861-4f8d850d55a0.filesusr.com/ugd/0d2aa0_142b6c6c59e84c408fab9dccdd5fc8d1.pdf?index=trueIn PDF document text
    • http://reladefuxuna.onlinewebshop.net/pulse_oximetry_nejm.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f944.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF944 5316 bytes
SHA-256: 866a8c0814c3da5812b3488ea8b49e89dcab0b48a1cc6702946007266a222170
font_01_sfnt_off00010b54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B54 10900 bytes
SHA-256: a50791fc093edd3f3f4b3209df78bca3e12743a92ec4cb7b8c6df25373f0d694