Malicious PDF — malware analysis report

Static analysis result for SHA-256 316c74eb967eb718…

MALICIOUS

PDF

82.1 KB Created: 2021-05-03 18:58:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 2dd2fcae871e73f408250227d96319cb SHA-1: a6ec2cf70a240d0cb1bd61e855c2ada4e5dfc544 SHA-256: 316c74eb967eb7186344f19b8264346546f5c27cc615328d50fb2beb40b382ca
186 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 point to disposable hosting or redirectors, indicating a link farm designed to obscure the final destination. 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 URLs are indicative of a malicious document, potentially leveraging embedded JavaScript for redirection or exploitation.

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://leonvi.ru/strik?utm_term=contrato+alquiler+de+vivienda+en+word PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4374968/normal_601dceac24394.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365549/normal_604752f9375e0.pdfIn PDF document text
    • http://microbladingcertificationdfw.org/best_portable_car_jump_starter_with_air_compressorzxab5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456998/normal_60503498b2f68.pdfIn PDF document text
    • http://jamarifuto.iblogger.org/87804654209.pdfIn PDF document text
    • https://lutovadefok.weebly.com/uploads/1/3/3/9/133997447/fededij_vokiluvusike.pdfIn PDF document text
    • https://xisiwazebisa.weebly.com/uploads/1/3/4/7/134758569/0979382a83.pdfIn PDF document text
    • https://cdn.sqhk.co/xufuwejaxe/hhevU82/bogoketopubik.pdfIn PDF document text
    • http://nelodorofi.iblogger.org/74424213124.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422909/normal_6018ce76c07fa.pdfIn PDF document text
    • https://cdn.sqhk.co/lesepivir/XMigb4D/galaxy_s7_notes_backup.pdfIn PDF document text
    • http://copytoshka.ru/busazesasugobu1njoj.pdfIn PDF document text
    • http://frontend-developer-azaynullin.site/portals_tactical_2d_shooter_multiplayer11r09.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474759/normal_60159b827135e.pdfIn PDF document text
    • https://sarisiwubaj.weebly.com/uploads/1/3/0/7/130739508/xelukagesaguwedidav.pdfIn PDF document text
    • https://mekapejodefab.weebly.com/uploads/1/3/4/7/134740006/duxurisobe-buxubikazojixes-xiten.pdfIn PDF document text
    • http://marafonsport.site/what_does_an_absorbance_spectrum_tell_yourfhnz.pdfIn PDF document text
    • http://premial.su/penodurl1z7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483833/normal_5fe551d5f1bc3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off00010202.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10202 4824 bytes
SHA-256: a4d8839d89de628a552b131f4176297f31730c7083175fe5f10a8cd8e1219662
font_01_sfnt_off00011281.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11281 11908 bytes
SHA-256: aaeddae7a51e5bb43208c3ad49e8d38ec68a25e73c77bebb595dfb84a2be2c5d