Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a222f07dd05ea33…

MALICIOUS

PDF

74.4 KB Created: 2021-03-14 02:43:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 02c9ba3aa09b51a3a8d3bd1f81b2dc70 SHA-1: 623effe0a01489694ec5cd50e1632f59e37f5db9 SHA-256: 0a222f07dd05ea3354ccb9a20a946945f3bf6f582ae4f48a2c41704afceb28f9
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external URIs, with a significant number pointing to disposable hosting. The primary purpose appears to be SEO manipulation or directing users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://leonvi.ru/123?utm_term=punch+drink+pictures+free PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4496151/normal_60298e946472f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501479/normal_5fe4e79d02775.pdfIn PDF document text
    • https://cdn.sqhk.co/vemonososepa/BHhejhf/vememigisobazafotab.pdfIn PDF document text
    • https://nofefikow.weebly.com/uploads/1/3/4/5/134510094/kezadekonuneg.pdfIn PDF document text
    • https://cdn.sqhk.co/webepinovet/hbjiXjf/w3schools_python_dictionary_methods.pdfIn PDF document text
    • https://mogorabijeruli.weebly.com/uploads/1/3/1/3/131380728/fegorevuwufotej-roxulufuvikoz-lomegovabi-nuvup.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452861/normal_6018aee275fa9.pdfIn PDF document text
    • https://sikenobavusemel.weebly.com/uploads/1/3/2/6/132682861/letobi.pdfIn PDF document text
    • https://wovogivas.weebly.com/uploads/1/3/4/0/134012667/perede.pdfIn PDF document text
    • https://pijaremurepapo.weebly.com/uploads/1/3/1/4/131406688/873020.pdfIn PDF document text
    • https://cdn.sqhk.co/gitopedevid/jfzonhc/70728005797.pdfIn PDF document text
    • https://cdn.sqhk.co/sewuvavimebi/ie01Zij/bisokujorinikikikopuseref.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://29474179-7c7c-44ae-84e0-3c37792f2e25.filesusr.com/ugd/7f817d_85421f41aea04edc8d30950c1b4a1a09.pdf?index=trueIn PDF document text
    • https://4f0754e2-f0c4-47db-826b-83042027646c.filesusr.com/ugd/7a11b0_56dfff969fa447cebdcf0317c694d9cd.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dudigonifu/nazeluzidomujejosineran.pdfIn PDF document text
    • https://f1ddcea9-c323-452c-a4d3-aaefec61e50a.filesusr.com/ugd/defd8a_d9d2b21a4ccb417eaa5d9dfcbc3cbf4b.pdf?index=trueIn PDF document text
    • https://caa91486-5fcc-43b7-8b2b-5b817ae85bbe.filesusr.com/ugd/26bbcf_2a70e967a94547e0bfe4e2ee92fbbca5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/biwubeleba/camstudio_screen_recorder_crack.pdfIn PDF document text
    • https://64e18f06-8a0e-4dc1-8427-9dd81b4bff36.filesusr.com/ugd/baa514_3c8bd483696e44a28d67c6aba104e2f9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mutirexa/opinion_argument_essay_planning_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/bejexe/mapa_de_riesgos_trujillo.pdfIn PDF document text
    • https://d2d87fd5-5f4d-49aa-ab3c-2263ce4b5d22.filesusr.com/ugd/9169d2_a30f9518c7a14edebb0c96503a32828b.pdf?index=trueIn PDF document text
    • https://7ed754b6-a209-4558-9281-0032c7ee8ade.filesusr.com/ugd/4329d7_fe07cf81051e412d9c16f33b8d936c3b.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_off0000e8b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B4 5068 bytes
SHA-256: 4e8236a7ce9a55722124944e7bf0a89dc5ba2fc3cf5065fb19011c91e3b06cac
font_01_sfnt_off0000f9f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F0 10128 bytes
SHA-256: 0630dcae91b1d6b909b9ced0a5aeb3763f4eae6db215f886271fcbd74aca2446