Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8a2514f83445b99…

MALICIOUS

PDF

72.8 KB Created: 2021-02-15 10:40:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 77f2da9b8d0b0fd1d291ff1110ec85d2 SHA-1: cdc8042eead6acdb23ce17e0b3264b051461cd6c SHA-256: b8a2514f83445b999cda2ef66716042f6dfe8ea740b315858817cef9d05438ab
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classification and ClamAV. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing attempt. The embedded URLs point to various PDF files, likely intended to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jottigo.ru/123?utm_term=how+many+times+can+you+renew+your+cdl+permit PDF link annotation
    • https://mokapojigum.weebly.com/uploads/1/3/4/6/134690111/ad93149.pdfIn PDF document text
    • https://cdn.sqhk.co/fenazijeguk/igcpu2V/64177231157.pdfIn PDF document text
    • https://cdn.sqhk.co/letijefa/haghxjh/mujekemadu.pdfIn PDF document text
    • https://cdn.sqhk.co/mikevoponage/f5GjbDz/11122417285.pdfIn PDF document text
    • https://wenojobopowegit.weebly.com/uploads/1/3/4/8/134879608/77174aa4d.pdfIn PDF document text
    • https://wimofitadaxota.weebly.com/uploads/1/3/4/3/134362004/felega-fanemus.pdfIn PDF document text
    • https://sukorason.weebly.com/uploads/1/3/4/5/134578332/621639ce65e1.pdfIn PDF document text
    • https://buwapagav.weebly.com/uploads/1/3/1/3/131383965/zodurilubugozu_kipixar.pdfIn PDF document text
    • https://muwalivom.weebly.com/uploads/1/3/2/6/132695892/8225546.pdfIn PDF document text
    • https://vufagejibuto.weebly.com/uploads/1/3/1/4/131483336/wonubin-bejiworasu-dunupodamo-gigonigugo.pdfIn PDF document text
    • https://cdn.sqhk.co/gemadaruvow/chaidcW/laloliwaxozepomavex.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://juvuzonowokogu.rf.gd/circular_column_interaction_diagram_spreadsheet.pdfIn PDF document text
    • http://verirajoxa.epizy.com/chrome_for_windows_8._1_pc.pdfIn PDF document text
    • http://xinasewaja.epizy.com/peronuxidowoxotowoz.pdfIn PDF document text
    • http://fowasabitafal.epizy.com/mefutixujolozezukado.pdfIn PDF document text
    • http://jomewuborova.rf.gd/51324475791.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d2f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2F6 5256 bytes
SHA-256: 39954c0dc5283f3b98dad20d760465f73af8c8ae4bb0e1f41b4d0860732c354d
font_01_sfnt_off0000e4c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C6 10260 bytes
SHA-256: da3d4e4869ecb55920c43686ad415e127be64f575552ef0cf47e5342d94536b3
font_02_sfnt_off000107fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107FD 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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