Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac0bd789867d4826…

MALICIOUS

PDF

112.5 KB Created: 2021-05-11 12:19:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 57b49948468e341ccebee8d0407a8811 SHA-1: a9ee84c5f0498a5b0a8d8a53196f9ca9df93844a SHA-256: ac0bd789867d4826be60ff25393ddaf05f5b7a77922ca4bfa380d4de5b2dfc56
126 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating it is a link farm on disposable hosting, with a high ML score and ClamAV detection as a phishing trojan. The embedded URL `https://baarspo.ru/strik?utm_term=twilight+book+series+release+dates` is the primary indicator of malicious intent, likely serving as a lure for phishing or malware distribution. No scripts were extracted, but the overall structure and URL suggest a phishing attack delivered as an attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://baarspo.ru/strik?utm_term=twilight+book+series+release+dates PDF link annotation
    • https://tokarakuwo.weebly.com/uploads/1/3/0/9/130969339/dalijukolapapif.pdfIn PDF document text
    • http://jidudilubad.mygamesonline.org/11139272612.pdfIn PDF document text
    • https://rekepepijo.weebly.com/uploads/1/3/4/0/134018016/339017.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455403/normal_606ac91559427.pdfIn PDF document text
    • http://ramifapufebi.scienceontheweb.net/atmospheric_pressure_and_gauge_pressure.pdfIn PDF document text
    • https://zowutopukanujim.weebly.com/uploads/1/3/4/2/134235103/1985cf78.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374198/normal_6033cc955be1e.pdfIn PDF document text
    • http://jedusajinud.mygamesonline.org/17340881107.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496005/normal_60446673c98de.pdfIn PDF document text
    • https://wolunogejafijut.weebly.com/uploads/1/3/4/6/134649672/7079106.pdfIn PDF document text
    • https://dubiroki.weebly.com/uploads/1/3/1/4/131483307/tedabiwekavapuvadok.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zedilegol/waxanepefibosexisit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e64b34a3-8478-4102-9876-d12a391c8e23/zuvaf.pdfIn PDF document text
    • http://vaxutere.rf.gd/hp_laserjet_p2055dn_weight.pdfIn PDF document text
    • http://zitasixan.atwebpages.com/likepakikuv.pdfIn PDF document text
    • https://s3.amazonaws.com/bezegoluzose/weather_report_manzanita_oregon.pdfIn PDF document text
    • https://s3.amazonaws.com/rawesaragegugar/xuxebi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ae9372a-89a6-4f32-94c8-dc9c3005b38b/pumptrol_pressure_switch_reset_without_lever.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f17c0bdb-cf7b-4e3a-8328-2a8366747a75/negajumugikegifosenoninej.pdfIn PDF document text
    • http://xemunebo.atwebpages.com/50809652213.pdfIn PDF document text
    • http://mepudizik.rf.gd/97366191191.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e1e2954-6642-4a3f-87dd-d32383fa52d9/68735474547.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e928e05e-417c-4039-937d-060615c239e8/55199839420.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000165e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x165E6 5332 bytes
SHA-256: 346761c5475bc8bf855712237088104ebdf60e12a2e80678ff20344ea655f15d
font_01_sfnt_off0001780f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1780F 11752 bytes
SHA-256: 13796a772deb6f906ce1d7af68f0f2d93504f37325d76911fddeedc34f61d79a
font_02_sfnt_off00019fa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19FA4 16060 bytes
SHA-256: 2173a1880e9f774f759393e7d0d28dda91d04d8a3eae6bea41b822770b343b90