Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7ae1709fee180ad…

MALICIOUS

PDF

73.0 KB Created: 2021-03-14 05:44:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 1beaf91fe409f9f920b3c9799217f6ac SHA-1: 998ca6b7419869d623635fb0951fabd421b70b61 SHA-256: c7ae1709fee180adbef2995c81d6657e5397e89a1ec29260573b7a6edfc507e2
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://pelibifir.ru/strik?utm_term=wordpress+website+development+cost+in+india PDF link annotation
    • https://livesagu.weebly.com/uploads/1/3/1/4/131437401/gilov.pdfIn PDF document text
    • http://gamowenugeg.sportsontheweb.net/librecad_freecad_qcad.pdfIn PDF document text
    • http://xedijama.getenjoyment.net/87168155293.pdfIn PDF document text
    • https://cdn.sqhk.co/nowavutu/77gdHjj/nba2k20_locker_codes_vc._org.pdfIn PDF document text
    • https://cdn.sqhk.co/tejurorado/hdmGh8G/47463970712.pdfIn PDF document text
    • http://kujazudoxiro.22web.org/badger_football_schedule_2018.pdfIn PDF document text
    • https://xularidamilizal.weebly.com/uploads/1/3/4/6/134685918/3966223.pdfIn PDF document text
    • https://pekedepak.weebly.com/uploads/1/3/5/3/135399439/8336067.pdfIn PDF document text
    • https://jurulekoteg.weebly.com/uploads/1/3/4/7/134700509/47eb94b5ac7fcb.pdfIn PDF document text
    • https://vulopinuvi.weebly.com/uploads/1/3/1/1/131164419/8365410.pdfIn PDF document text
    • https://ribofefafuf.weebly.com/uploads/1/3/4/7/134770843/1fe6c1d.pdfIn PDF document text
    • http://birebap.scienceontheweb.net/minn_kota_i_pilot_link_app.pdfIn PDF document text
    • https://zevigetadafuwun.weebly.com/uploads/1/3/0/9/130969942/7465926.pdfIn PDF document text
    • http://trastqort.online/digestive_system_processes_chemical_and_physical1uuzz.pdfIn PDF document text
    • http://lotsmen.com/signs_someone_really_like_you2vq0k.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://joriboka.epizy.com/67041892435.pdfIn PDF document text
    • http://ranuvurimokolow.rf.gd/yesterday_beatles_piano_sheet.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_off0000dd85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD85 5524 bytes
SHA-256: 5c68122066ba033e8240c30f5965cef6561761c3c4e6c4f2a50d0fac72c2e0f3
font_01_sfnt_off0000f049.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF049 10768 bytes
SHA-256: 9aedbf06ea0b57f30bdfdb7823c0b7c6e3f9affaf396ef938c4ee9b41a9499a7

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