Malicious PDF — malware analysis report

Static analysis result for SHA-256 a63cb86b9b63ff6f…

MALICIOUS

PDF

74.4 KB Created: 2021-09-09 17:17:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9cc56e9ec1a71cbfdbfc72d890d9c420 SHA-1: a5f60d0e6b3331acc634ca274ff2b27e0008937e SHA-256: a63cb86b9b63ff6fcee8332603abebd60a7678568b5c6fb23f977188d40b9054
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting it's used to redirect users to potentially harmful websites. The presence of embedded URLs and the PDF structure point towards a phishing or malware distribution lure, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://allytemp.ru/uplcv?utm_term=ps+plus+apk PDF link annotation
    • http://exosportsante.fr/ckfinder/userfiles/files/pigejajorepavijun.pdfIn PDF document text
    • http://thesnowmanicecream.com/ckfinder/userfiles/files/vapinamupifupexufa.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210904022519653.pdfIn PDF document text
    • http://hockeydh.com/files/ups/files/kebaladatafikexama.pdfIn PDF document text
    • http://xn----gtbercbfedtm3b.xn--p1ai/admin/ckfinder/userfiles/files/seduwusisulagojasekovaja.pdfIn PDF document text
    • http://teormech.ru/teormech/usrimg/file/42762080461.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/161328208da572---kusitinen.pdfIn PDF document text
    • http://tbeaindia.com/userfiles/file/bojawijuvawujomala.pdfIn PDF document text
    • http://enewind.com/pliki/file/93511038144.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/tikalek.pdfIn PDF document text
    • http://gimhaejazz.com/fckeditor/userfiles/image/13917236261.pdfIn PDF document text
    • http://daearesort.com/FileData/ckfinder/files/20210904_5E7BB0DF9C59B994.pdfIn PDF document text
    • http://polletnv.be/uploads/files/30193021629.pdfIn PDF document text
    • http://zimmerei-possert.at/28624186232.pdfIn PDF document text
    • http://freestyler.cz/img/file/ruwojixunokatiw.pdfIn PDF document text
    • https://rugerwafers.com/demo/ruger/beta/userfiles/files/ritojegofaxazezidori.pdfIn PDF document text
    • https://srmhomes.com/images/bulk_images/files/kararuxinokegufoforejemuj.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612efe1a7d063---sekogodi.pdfIn PDF document text
    • https://cqhuaan.myhost360.cn/upload/files/09-04-05-09-02-31.pdfIn PDF document text
    • https://planningpvedh.nl/ckfinder/userfiles/files/didibepuputulipaxilurowe.pdfIn PDF document text
    • https://mkontroll.hu/File/xixafe.pdfIn PDF document text
    • http://flagrant-desir.com/userfiles/file/nuzevufum.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_off0000bbfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBFE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d410.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD410 19488 bytes
SHA-256: 61a3a75889fa831e85c7366ec0441ce64612770a318bf024cabe8f81532f0ae7
font_02_sfnt_off00010709.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10709 9792 bytes
SHA-256: 0a56db22c8de79c2f3b9d78ad0b1027af4ca78b0dbc58f398593d503ea66434f

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