Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e73b689cd02de6a…

MALICIOUS

PDF

83.9 KB Created: 2021-03-17 13:10:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 3a319753f0034e955039d249f60c5d93 SHA-1: 61c6553dbcc0fb8ca645985013e38f42efe2ae57 SHA-256: 9e73b689cd02de6a11e565fcb1f035bfc67a89ce9a925c8dddd78c2324e70d74
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a link farm. This suggests a phishing or SEO manipulation attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of numerous external URLs points towards a potential download or redirection mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://ponafet.ru/strik?utm_term=fender+passport+150+vs+250 PDF link annotation
    • https://dowisapi.weebly.com/uploads/1/3/4/2/134266119/1667319.pdfIn PDF document text
    • http://rabevazilogu.iblogger.org/lonely_shepherd_song.pdfIn PDF document text
    • https://pisixaxonazav.weebly.com/uploads/1/3/5/3/135394173/b6c0a9e.pdfIn PDF document text
    • https://gemaxapofa.weebly.com/uploads/1/3/2/6/132681544/metirelojaz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379603/normal_6011d6e9022e6.pdfIn PDF document text
    • http://dogazalalun.22web.org/30021951015.pdfIn PDF document text
    • https://xodinelexobi.weebly.com/uploads/1/3/1/4/131438891/lelefodoberamopi.pdfIn PDF document text
    • https://xamubamujizej.weebly.com/uploads/1/3/1/4/131483378/bapisunipolubiranuma.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371498/normal_6031bd71328c3.pdfIn PDF document text
    • https://dexajaxalujum.weebly.com/uploads/1/3/1/8/131857565/92007.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416921/normal_6011e14c97d61.pdfIn PDF document text
    • https://gegirugotosizuk.weebly.com/uploads/1/3/5/3/135397722/zutusavenelula.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374374/normal_603da41adda75.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
    • https://s3.amazonaws.com/vovuzize/70828563989.pdfIn PDF document text
    • http://zegokufa.epizy.com/zipofiw.pdfIn PDF document text
    • http://filazit.epizy.com/57456639595.pdfIn PDF document text
    • http://posawutuz.rf.gd/bsc_economics_syllabus.pdfIn PDF document text
    • http://sevetise.rf.gd/how_many_appliances_can_a_5_500_watt_generator_run.pdfIn PDF document text
    • https://s3.amazonaws.com/lomuper/subaru_pressure_washer_pump_protector.pdfIn PDF document text
    • https://s3.amazonaws.com/rikolesafuwofar/axes_io_mod_apk_offline.pdfIn PDF document text
    • http://xadugatu.epizy.com/serial_number_freemake_video_converter.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_off0000f9e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E2 5124 bytes
SHA-256: 94e7c3d6503f5fd6cf41a582627aea5f63bd738eed1665bcb8a33cdc9858456b
font_01_sfnt_off00010b59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B59 11708 bytes
SHA-256: 836a2380e7443dccdba9837e96a11e2cc432a55aa422c1e55829c24a6c4370dd
font_02_sfnt_off000132ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132AC 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333