Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5a2c087a0e58841…

MALICIOUS

PDF

79.9 KB Created: 2021-09-19 01:16:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6c960a7d32b05321aac2ee6f085be5aa SHA-1: 5900006feea2ea9b9cf6736c748d097a789da5a1 SHA-256: a5a2c087a0e5884109400a43bbba6c8d56dd38c1eb47ab7951d08b7426e1aa42
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting and are structured as link farms, suggesting an intent to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://wastran.ru/uplcv?utm_term=geometry+similarity+test+pdf PDF link annotation
    • http://rioairporttransfer.com/ckfinder/userfiles/files/sujilolikafatatepapotatem.pdfIn PDF document text
    • http://vatlieubaooncachnhiet.com/userfiles/file/mobojelemivodologod.pdfIn PDF document text
    • https://electroagro.es/pub/files/zutidusizili.pdfIn PDF document text
    • https://foundryindia.org/userfiles/file/kevinesobason.pdfIn PDF document text
    • http://magdrywall.com/project-new/christianbook/upload_images/file/18505298124.pdfIn PDF document text
    • http://punaide.com/userfiles/files/sinefesulefotuj.pdfIn PDF document text
    • https://shopinhome.com/ci/userfiles/files/vofivo.pdfIn PDF document text
    • http://inica.org/files/file///8549300355.pdfIn PDF document text
    • http://bpabv.nl/uploadfiles/file/jeros.pdfIn PDF document text
    • https://uzmanwebci.com/calisma2/files/uploads/37379643480.pdfIn PDF document text
    • https://producedepot.us/userfiles/files/xegujebasixabepir.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/161383ae9f2e27---kibesadozekupotidar.pdfIn PDF document text
    • https://eastoncn.housemember.com/uploads/files/27611805440.pdfIn PDF document text
    • http://www.herbertvanderbrugghen.nl/draft/68566172354.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc7d6b0ce7---segikodole.pdfIn PDF document text
    • https://bhiringisamsankalimandir.org/ckfinder/userfiles/files/4701562970.pdfIn PDF document text
    • http://tehpromyar.ru/media/file/20565504841.pdfIn PDF document text
    • https://ketex.com/trcgp/ckfinder/userfiles/files/pizenekugafezetilemago.pdfIn PDF document text
    • http://mama-care.com/UserFiles/file/1589448231.pdfIn PDF document text
    • https://coolingrealestate.com/your-home-cleaner/FCKuploads/file/87500132018.pdfIn PDF document text
    • http://oxigensupplies.com/shipinc/userfiles/files/57878041796.pdfIn PDF document text
    • http://hrampetraipavlavosstanovlenie.ru/content/images/user/file/40452639618.pdfIn PDF document text
    • https://esperidiaogomes.com/userfiles/files/vaviguxavupaliradi.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_off0000d1ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1CE 18336 bytes
SHA-256: e19f677718e12d713cf72e2f665d2d510f04b8cf347d350603dcc3df8617fe6a
font_01_sfnt_off00010101.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10101 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011918.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11918 10708 bytes
SHA-256: d29cb678a599ed099cc1418139c475b061deeecd39ade7424eef3fbe0b1531da