Malicious PDF — malware analysis report

Static analysis result for SHA-256 87a2f065f1833050…

MALICIOUS

PDF

82.6 KB Created: 2021-09-23 01:32:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 9b8f5f86e9a9308158c6c19b806a771c SHA-1: 8902f971fdc5b1d22c9450f8551f13af18d92b96 SHA-256: 87a2f065f1833050156be20312ca18bc241b253a87c25a04ec001d6837a1efe7
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, embedding numerous URLs, some of which point to raw IP addresses, likely to redirect users to malicious content or phishing sites. The document body is unreadable, suggesting it may contain obfuscated content or exploit code.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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 http://xn--80akoseq9f.xn--p1ai/userfiles/file/vadalidonurumapuwuwulutu.pdf In PDF document text
    • http://constantcontinuity.com/membership/data/files/24526020989.pdfIn PDF document text
    • http://faradtvandor.hu/picture/userfiles/file/45283712956.pdfIn PDF document text
    • https://adtw1.com/ckfinder/userfiles/files/61356057986.pdfIn PDF document text
    • https://bodymart.in/ckfinder/userfiles/files/24041337233.pdfIn PDF document text
    • https://worldmedglobal.com/userfiles/files/42090422451.pdfIn PDF document text
    • https://fototipia.hu/files/files/wopukogixupugag.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1613c5e8e88a14---79280596213.pdfIn PDF document text
    • https://cedria.es/DOCUMENTS/FotosFCKEditor/file/vuloxa.pdfIn PDF document text
    • http://muntepa.com/userfiles/files/tifebivosifarekabijigud.pdfIn PDF document text
    • http://xn--b1adrijbbb.xn--p1ai/upload_picture/surazad.pdfIn PDF document text
    • http://www.jokilaaksonratsastajat.fi/file/vorapedevo.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/60ac6d2cf8a7f772fea38b91943510f5/6087298883.pdfIn PDF document text
    • https://www.agencesramos.com/ckfinder/userfiles/files/82341383141.pdfIn PDF document text
    • https://medicabg.com/uploads/wysiwyg/files/61047428428.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/161354fd7a4c3f---kubokona.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/wexibipatopu.pdfIn PDF document text
    • https://artenika.pl/fck/file/26596270063.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b9fba1aa1f---jadevikerigediz.pdfPDF link annotation
    • https://vzduchotechnickefiltry.cz/docs/zinopuxix.pdfIn PDF document text
    • http://geoass.eu/userfiles/files/75981999282.pdfIn PDF document text
    • https://dursunguney.com/userfiles/files/15663991926.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=famous+ringtones+in+kannadaPDF link annotation
    • 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_off0000e0cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0CD 10716 bytes
SHA-256: 6dec17df8c41e3a1f504a29998f0808d51819daa30b51b569086674dcc8007ae
font_01_sfnt_off0000f92f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF92F 16920 bytes
SHA-256: c418c623c65a75eb4617bc8f35057c9d3747670cee7492620a4ec5837a39ae73
font_02_sfnt_off000124d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1