Malicious PDF — malware analysis report

Static analysis result for SHA-256 13ca4f0b253aa521…

MALICIOUS

PDF

84.3 KB Created: 2021-03-29 04:13:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cc606c1f40f59635047116f67b1c5065 SHA-1: 20c5e84ce9ec746343eacd563c502d5617cf499c SHA-256: 13ca4f0b253aa5216a9e0fccaf6bfbae4c447ba0e6c892db8eb62ad9d6cd611c
164 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are to suspicious domains, indicating a link farm or SEO poisoning attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URIs suggest it's designed to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://bologen.ru/wix?keyword=factotum+descargar+pdf+espa%25C3%25B1ol
    • http://nuloriwilorij.scienceontheweb.net/59664285433.pdf
    • https://jatufajikovuna.weebly.com/uploads/1/3/4/7/134719937/580ae517b1a0b.pdf
    • https://tuzuxomewe.weebly.com/uploads/1/3/4/5/134527180/samefixijelizew_vetuzukupuv.pdf
    • https://cdn.sqhk.co/butexuvokufo/dgjhehc/fosaxukarof.pdf
    • http://wiwajekirutiw.scienceontheweb.net/3071484094.pdf
    • http://sungo1.space/janulefiduropo623te.pdf
    • http://womizepivilora.sportsontheweb.net/puganolumavikikilipi.pdf
    • https://cdn.sqhk.co/rerunaropiz/ggcAaLQ/67477287250.pdf
    • http://gawudubigojan.getenjoyment.net/atheist_beliefs.pdf
    • https://cdn.sqhk.co/loxusovi/4ugfijs/56146699217.pdf
    • https://cdn.sqhk.co/gizukakom/aNgjXjg/62972435210.pdf
    • http://pekefosijemibi.sportsontheweb.net/aisi_8620_material_properties.pdf
    • http://kevufeduwatawos.mypressonline.com/piano_sheet_music_free.pdf
    • https://cdn.sqhk.co/bamosabubesi/agiIAje/timapotipamitafuxumesus.pdf
    • http://clipshd.design/94238125361uxpeu.pdf
    • http://vomimaforotagi.mywebcommunity.org/99874038770.pdf
    • http://lifeeuro.info/29431498048rqpy7.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://4779f2f8-a33e-4327-9c78-21ee0bcf4620.filesusr.com/ugd/31bf02_fbf962df982f41b8a4a741f7ccac6100.pdf?index=true
    • https://28481333-1ef2-46fb-8ebf-d56c3f24acbc.filesusr.com/ugd/314c35_570de94267b240e68d74246dcd6d0a78.pdf?index=true
    • http://dakafatuvuguviz.atwebpages.com/jokixudazi.pdf
    • https://ce3a146a-d504-4efb-981c-4593fb85d965.filesusr.com/ugd/5b5da7_2f81c59ee3ca44649f86f652d127ec28.pdf?index=true
    • https://dc010c70-835d-4b56-8cb0-1e1bda7cab64.filesusr.com/ugd/fb576b_3a9fc53a553841a2ba0d567a7f80d469.pdf?index=true
    • https://4d75d3c9-3a4d-4df6-84ab-e48b83d723e5.filesusr.com/ugd/cdb50c_b25949b8ffc741999db475c126b1584b.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee16.bin
00cc979fb1ea0df24d90e0e160090bbd418ee03e0f4b7dd0bcc87140d9a05c78		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE16 5640 bytes
font_01_sfnt_off000100f1.bin
2b12733d489f7921acf0cc2358d5a971773b643577aae1a56e84e11537acd87e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100F1 13484 bytes
font_02_sfnt_off00012c46.bin
296b33a6e69ac3fa8ed420f1d1b401a0712a5a108b7c5c6efc73671719323d57		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12C46 16192 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.