Malicious PDF — malware analysis report

Static analysis result for SHA-256 f477bb30836fc127…

MALICIOUS

PDF

78.3 KB Created: 2021-05-08 08:58:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 03838ba4201f6047fe52b1d7302525b8 SHA-1: ada4cbf7effd8450b547ea70200241bf6fb16855 SHA-256: f477bb30836fc127ae9faf084a656b7ec14a4628f2e50dbf434fcdb3624f71a2
126 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to phishing or malware distribution sites. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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 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/strik?utm_term=how+does+sub+zero+ice+maker+work PDF link annotation
    • http://healthyforczechrepublic.site/75276671712qyd5q.pdfIn PDF document text
    • http://kapabifidi.sportsontheweb.net/cisplatin_induced_nephrotoxicity.pdfIn PDF document text
    • https://kuxiwapanipajof.weebly.com/uploads/1/3/0/9/130969705/xizuranupoduf.pdfIn PDF document text
    • http://domavera.ru/wotigotujokunimak2fy8c.pdfIn PDF document text
    • http://autokenn.com/xatusavixowojadudixufsvioy.pdfIn PDF document text
    • http://ketadiets.site/sowubafepiwosonadsbgtw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376404/normal_6060d74aa7066.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368479/normal_60505313bddad.pdfIn PDF document text
    • https://savatevadenu.weebly.com/uploads/1/3/1/4/131452836/2810671.pdfIn PDF document text
    • https://sobopagugakevul.weebly.com/uploads/1/3/4/8/134881985/9553604.pdfIn PDF document text
    • https://nuwoveforu.weebly.com/uploads/1/3/4/0/134099073/vikatofaxifas-norozopiwil-zabezige-pifoxivizefezi.pdfIn PDF document text
    • http://creamspait.xyz/phpstorm_reformat_code_foldercy56m.pdfIn PDF document text
    • https://jipuzalo.weebly.com/uploads/1/3/4/6/134693454/jamebitowudede_duwaw_lemof.pdfIn PDF document text
    • http://golomashvanna.xyz/tafurozimuxowl0g97.pdfIn PDF document text
    • http://prizinsta24.online/wasasovejuzotolozevezafiv5atau.pdfIn PDF document text
    • http://cparta.moscow/assassins_creed_chronological_orderj3xm1.pdfIn PDF document text
    • http://terugate.mypressonline.com/gejasopikolamom.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/f344cfdc-732b-4dd2-aa38-1ee1ef0c93d1/28742816050.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1bfef0fc-d993-4146-bd21-b41529a9b53a/vizokofazosumajeboba.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1321a17a-23f3-41ca-94aa-7ae2961bed4c/shark_navigator_lift_away_deluxe_lost_suction.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c07706f8-f8c0-4b96-899f-8ea2c23a9f09/91344923665.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d5b9d55-7ff5-41a1-a388-54992e1d313c/16886921866.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_off0000f51e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF51E 5360 bytes
SHA-256: bf52a0554ff0437e29254e9517dd0ab4553ecf4c9ce7e289b82eeec900f2b954
font_01_sfnt_off00010758.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10758 10568 bytes
SHA-256: 6824f553bbef54c0df50cc63c8859123a9938a12833dc0522e9839f5fb428d51

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