Malicious PDF — malware analysis report

Static analysis result for SHA-256 52ee43863cb95a29…

MALICIOUS

PDF

83.4 KB Created: 2021-09-10 14:32:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8cc1c0c8534c08fc08a14678df4448ac SHA-1: b6cba5b7165d57e44fe2e42240c025ecc5422dae SHA-256: 52ee43863cb95a295f6d3dcf9e6570ff661874a923d44031adb01adf1c73dfc3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm with numerous external URLs. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a likely phishing or redirection attempt. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://catamma.ru/uplcv?utm_term=best+apps+to+buy+on+play+store PDF link annotation
    • https://aquatrustfina.com/userfiles/file/96562165722.pdfIn PDF document text
    • http://dbexpertise.fr/catalogue_dynamique/file/zikuxu.pdfIn PDF document text
    • http://franceplus.fr/userfiles/file/debejifatofu.pdfIn PDF document text
    • http://olgapolyakova.de/files/files/40470906971.pdfIn PDF document text
    • https://odlingfamily.com/userfiles/file/13408085477.pdfIn PDF document text
    • https://yarpaket.ru/userfiles/file/kazajizijadisaxa.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16136ccf01e04e---36773478232.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/c86e4900c6ae2ce4302ea7e76cda1551/14662724291.pdfIn PDF document text
    • http://ageofwonders.buka.ru/sadm_files/33966688030.pdfIn PDF document text
    • http://760_709737661.mildmedia-dev.eu/uploads/userfiles/files/vakijoxele.pdfIn PDF document text
    • http://yule-sign.com/upload/editor/file/20210905145258.pdfIn PDF document text
    • http://dsagco.com/Upload/file/kovazetaxem.pdfIn PDF document text
    • https://bleikss.com/userfiles/file/76588550962.pdfIn PDF document text
    • http://saipanbooking.com/FileData/ckfinder/files/20210908_469DB75A408E8BA7.pdfIn PDF document text
    • http://plan.msu.ac.th/ckfinder/userfiles/files/raruwimekise.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/vunokagiziralam.pdfIn PDF document text
    • http://highendschmiede.de/highendfiles/file/ledizarawobiwidunedewuji.pdfIn PDF document text
    • http://talcmanagement.com/uploaded_files/userfiles/files/vududik.pdfIn PDF document text
    • http://joesservicecenternj.com/userfiles/files/58815102790.pdfIn PDF document text
    • http://esistore.com/userfiles/file/54122289782.pdfIn PDF document text
    • https://greenboo.vn/uploads/files/tijunugepuzokibolelamoxa.pdfIn PDF document text
    • http://evola.it/userfiles/files/bamubepogogubajesa.pdfIn PDF document text
    • http://hanyuchina.com/upload/files/xunaxufebobexuluvoxabifa.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_off0000e151.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE151 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f963.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF963 17688 bytes
SHA-256: 8635aee113ef97f2df45331665c97de73c007980652c042a979add7667dbc9a7
font_02_sfnt_off00012748.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12748 10560 bytes
SHA-256: 85855c00d141407dcfeb18c9339a1d28ed2e9092ca6652e0d1e5cef99d105af0

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