Malicious PDF — malware analysis report

Static analysis result for SHA-256 d88aadfa44e7bbc2…

MALICIOUS

PDF

76.3 KB Created: 2021-03-30 23:34:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 4d356df55f8a9ddea003e8859860015b SHA-1: c85fff8a8e353d8e22b29800f1e06e5fcbde63b0 SHA-256: d88aadfa44e7bbc2615a2c07cd0da23711d0964c7bf625882a0874414584b993
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file contains a significant number of external links, many hosted on disposable domains, indicative of a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links point towards an exploitation attempt, possibly leveraging embedded JavaScript or other PDF vulnerabilities to execute a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ponafet.ru/123?utm_term=cocktail+menu+template+psd PDF link annotation
    • http://worameruvejaka.mywebcommunity.org/office_365_word_tutorial.pdfIn PDF document text
    • http://lazirawolewok.getenjoyment.net/cefalotina_mecanismo_de_accion.pdfIn PDF document text
    • https://xajadigosulibab.weebly.com/uploads/1/3/4/6/134650053/458ac26.pdfIn PDF document text
    • http://nubupexajed.iblogger.org/social_zooarchaeology.pdfIn PDF document text
    • https://tovepeluzon.weebly.com/uploads/1/3/4/3/134385389/pifidutiv.pdfIn PDF document text
    • http://bamupiwabibajew.mywebcommunity.org/63514035665.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://livirava.atwebpages.com/gegifogoselasagivip.pdfIn PDF document text
    • http://jowokepo.atwebpages.com/66137525143.pdfIn PDF document text
    • https://2e6726a7-2e78-456a-9fa1-8bc85c3b20a6.filesusr.com/ugd/76e31d_bacf3ab917c54f06ac2eba6bbf7ce78a.pdf?index=trueIn PDF document text
    • https://c4bedd8b-a3e9-4aa8-9751-a6fde4035b7e.filesusr.com/ugd/037f08_142d2be282244ee4bb94bd64f09985c8.pdf?index=trueIn PDF document text
    • http://gejizejaniwijef.atwebpages.com/savuma.pdfIn PDF document text
    • http://mekidojakad.rf.gd/xowamubusubefip.pdfIn PDF document text
    • http://mozaninukokefef.onlinewebshop.net/74061195767.pdfIn PDF document text
    • http://naluvexuwemajub.rf.gd/85331052426.pdfIn PDF document text
    • https://0c6b7a74-1ca0-41da-943c-c268a208a416.filesusr.com/ugd/fef373_4fabd9d274e346c7b4c46327306719e8.pdf?index=trueIn PDF document text
    • https://ac09d6fb-20d1-47e2-97cb-2568fc137cdf.filesusr.com/ugd/03dcd4_54f20a326db84ca9a51aac9fc2e5e868.pdf?index=trueIn PDF document text
    • http://zuxekesimulir.epizy.com/21176930350.pdfIn PDF document text
    • http://jaxivaganidira.epizy.com/2013_jeep_grand_cherokee_transmission_fluid_check.pdfIn PDF document text
    • https://c809e8a6-5bdf-489d-8d8c-df4e4638a115.filesusr.com/ugd/45a296_e1fa338d03474774a25490256424db91.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED21 5092 bytes
SHA-256: 8bad11efe62449eebc40a46ead7ea10e5a99cbfcf69cfa2f84d07f107cb14f13
font_01_sfnt_off0000fe60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE60 11176 bytes
SHA-256: c290d4685e62d1812359b4a980b4dbd014b74fe468d4ccdf89cf8979950c0188