Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8d2822ebfc3f4f2…

MALICIOUS

PDF

82.2 KB Created: 2021-09-13 18:36:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: dae84eac606203fbbab3b3948d9fe358 SHA-1: e56cc5e372491aafe6ccafbe8c68952244035dd3 SHA-256: a8d2822ebfc3f4f2360c35a4bf9c594cf320a177946a65faafe77462a358d44d
126 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests it is part of a link farm designed to redirect users, likely for phishing or malware distribution. The presence of numerous unknown URLs further supports this, with one specific URL identified as a potential entry point.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://imi.vc/upload/files/17016845550.pdf In PDF document text
    • http://kuhomania.ru/ckfinder/userfiles/files/57977253504.pdfIn PDF document text
    • http://shopabrang.com/images/files/figoxosimitebajokuro.pdfIn PDF document text
    • http://pospatrans.cz/UserFiles/File/39341481401.pdfIn PDF document text
    • http://jlsxjy.com/right/UploadFile/file///2021090909025873499.pdfIn PDF document text
    • http://terremeraude.com/userfiles/file/5004177270.pdfIn PDF document text
    • https://jooli.ru/ckfinder/userfiles/files/walawuderimuwanovutas.pdfIn PDF document text
    • http://stellar-toys.com/ckfinder/userfiles/files/1006432544.pdfIn PDF document text
    • http://snft.ro/media/file/92297547861.pdfIn PDF document text
    • https://emmaushuis.org/pages/73372979089.pdfIn PDF document text
    • https://adtw1.com/ckfinder/userfiles/files/dilubozasumusefatipeduka.pdfIn PDF document text
    • https://dienmayminhchau.vn/uploads/news_file/zaditifimudugopaduti.pdfIn PDF document text
    • http://wang023spa.com/userfiles/202109file/2021090905010270554.pdfIn PDF document text
    • https://nitm.ac.in/nitmeghalaya/ckfinder/userfiles/files/gakatazolejimuzu.pdfIn PDF document text
    • http://fertilityupdates.com/userfiles/files/80475758832.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613344aa4ced9---tawekasulapofuwu.pdfIn PDF document text
    • http://anaminfo.com/attachfile/file/12655438885.pdfIn PDF document text
    • http://excitechem.com/userfiles/file/rijulojezu.pdfIn PDF document text
    • https://digireg.cn/upload/wuvexegodebewibubid.pdfIn PDF document text
    • http://printific.com/images/contentimages/files/taverutaxinofobata.pdfIn PDF document text
    • https://k-barrierfree.com/FileData/ckfinder/files/20210907_429A0B3DAA47D542.pdfIn PDF document text
    • https://bhiringisamsankalimandir.org/ckfinder/userfiles/files/sisasagaxinigesi.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f26f710b89---ruwikenumaduwuzabikaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=infinite+canvas+app+androidPDF 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_off0000d9d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D9 10584 bytes
SHA-256: 09a95e7dc57dae32f95443918454eaa9e432c73af2a82eb2b5d6f3315267d56c
font_01_sfnt_off0000f227.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF227 18848 bytes
SHA-256: ad57ae567e1e1f572c87138d680cb309c3f9eee33f6356aeab43ad5bf6a00cd5
font_02_sfnt_off00012303.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12303 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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