Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a36f3fdb04fa2dc…

MALICIOUS

PDF

109.4 KB Created: 2021-10-09 20:45:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 324cbe54fd93272a73ef1d24d043d8dc SHA-1: 1ec8f2bd0ea3767c8eaa992814bb85ee8c157154 SHA-256: 8a36f3fdb04fa2dc2c44f8dff67872261891c705f579a5c385d2a5f2d423e41e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution intent. It contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting it's designed to redirect users to potentially harmful websites. The presence of embedded URLs and the nature of the heuristics strongly suggest an attempt to deliver a second-stage payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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 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://crysiq.ru/uplcv?utm_term=limbic+system+and+motivation PDF link annotation
    • http://samurairamenbar.com/uploads/files/laziwifog.pdfIn PDF document text
    • https://booknowrentalimo.ch/userfiles/files/16214893105.pdfIn PDF document text
    • http://safiorida.dk/operatori/userfiles/file/22107919434.pdfIn PDF document text
    • http://yearbookplus.com/uploads/ckfinder/files/fokizebasonisuwimenonom.pdfIn PDF document text
    • https://alansglobalservices.com/ckfinder/userfiles/files/jumaxapofaguwovujetexo.pdfIn PDF document text
    • http://reopen911.info/media/file/79562100741.pdfIn PDF document text
    • http://gewald.ru/content/Files/nebosimuwarasumuwaduso.pdfIn PDF document text
    • http://polipadel.com/userfiles/file/fagujarojalesapusaji.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/85849707607.pdfIn PDF document text
    • http://neuchina.org/userfiles/file/25436213471.pdfIn PDF document text
    • https://ekoelprom.pl/public/images/editor/file/jajeropiforazalomuv.pdfIn PDF document text
    • http://khojedu.net/userfiles/file/33840157598.pdfIn PDF document text
    • http://fantasymusic.it/userfiles/files/79103848198.pdfIn PDF document text
    • http://aromamahabaleshwar.com/ckfinder/userfiles/files/kumidelelakawib.pdfIn PDF document text
    • https://www.spitalmoldovanoua.ro/ckfinder/userfiles/files/fomesonoranevix.pdfIn PDF document text
    • http://bestofbeer.ru/ckfinder/userfiles/files/gasugufefubovuzekapabudos.pdfIn PDF document text
    • https://alves.bg/ckfinder/userfiles/files/27904093738.pdfIn PDF document text
    • https://marathonlaval.com/userfiles/files/vakezaxoli.pdfIn PDF document text
    • https://sportsslife.net/upload/ckfinder/files/bifovukinefebo.pdfIn PDF document text
    • http://thinhhoanggia.vn/Images_upload/files/bulovobivefevamo.pdfIn PDF document text
    • http://dental-forum.ru/userfiles/file/71649415799.pdfIn PDF document text
    • http://nbnjl.com/userfiles/files/52366396487.pdfIn PDF document text
    • http://www.mab-solutions.fr/upload/file/koxasobosideve.pdfIn PDF document text
    • http://pattarasawat.com/ckfinder/userfiles/files/pujabelidodol.pdfIn PDF document text
    • http://www.beverburcht.nl/upload/files/1295013304.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://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_off00014187.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14187 10664 bytes
SHA-256: d3d9407d43c11a2f478b3f38d2ba5779e10072c7ae0cd431ef0b488bf4b46a7f
font_01_sfnt_off00015a0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A0A 20532 bytes
SHA-256: 9805bcbda9bca04222e5beaa9c2328bb8755ae151967ba8545522a573b8a628e
font_02_sfnt_off00018f61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18F61 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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