Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2e8bcf9dd50b405…

MALICIOUS

PDF

75.3 KB Created: 2021-03-10 02:28:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 51ff43b241e574f940fb049b550eb985 SHA-1: a92f465c44ba9c143ed74ee1a5654f4408602fb3 SHA-256: d2e8bcf9dd50b40547a7868a0960862b7e6f66e820ff5bbee2fbb26ac1fd7772
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of external links pointing to various domains, many of which appear to be disposable hosting. This behavior is indicative of a link farm, often used for SEO manipulation or to distribute further malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://dugedepap.ru/award?keyword=design+methods+and+analysis+of+algorithms+pdf PDF link annotation
    • http://kifopelidito.mypressonline.com/ge_water_softener_gxsf30v_reviews.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464865/normal_603b3b7865d66.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405185/normal_600c217b9b02d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384039/normal_60286d1691153.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419423/normal_5fd637df5c8b6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403119/normal_5fdc4c4922df8.pdfIn PDF document text
    • http://bebetadiruj.mywebcommunity.org/78927085484.pdfIn PDF document text
    • http://zeruxejobimal.mywebcommunity.org/angiospermas_caractersticas.pdfIn PDF document text
    • http://ravigimojamel.mypressonline.com/cg_police_syllabus_2020_download.pdfIn PDF document text
    • https://cdn.sqhk.co/pirujezexod/fIGfigD/18137800776.pdfIn PDF document text
    • https://tirotirow.weebly.com/uploads/1/3/1/3/131380420/1df40.pdfIn PDF document text
    • https://cdn.sqhk.co/zetoxezoza/Yhjjf3P/40331180585.pdfIn PDF document text
    • http://tagaporigowekis.mygamesonline.org/46007482319.pdfIn PDF document text
    • http://pogawubujogeje.mypressonline.com/26_week_money_challenge_5_000.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450418/normal_5fee829c25cc8.pdfIn PDF document text
    • https://fewebiporunivag.weebly.com/uploads/1/3/0/7/130775920/mudugeni.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448558/normal_60114415bd0f2.pdfIn PDF document text
    • http://pobunav.sportsontheweb.net/tiwubadavugonavojodena.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481409/normal_5fef824194917.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449417/normal_5fd81744e4ef2.pdfIn PDF document text
    • https://wefupavoxed.weebly.com/uploads/1/3/2/6/132682659/f708ab0b9ddf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e826.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE826 5556 bytes
SHA-256: 33a87b0bfe1affbe209f8b7edc1f3ef9fc544f0959d4390394c33ba8c5198239
font_01_sfnt_off0000faef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAEF 10712 bytes
SHA-256: 8793acdbe9b6a4cf8ba0dbc40b04396d94036aa9b2009fbb170a3655a20e0920