Malicious PDF — malware analysis report

Static analysis result for SHA-256 b062a5f03aea19c0…

MALICIOUS

PDF

74.9 KB Created: 2021-10-01 00:20:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: ea4ce862f29d44b33d45e023e44d1e66 SHA-1: 501eb3e5e1a26057170bb9e97bcc50192764c1d1 SHA-256: b062a5f03aea19c0b48635921271f601be14cf8e8c64ba59c4bab3e918ad0247
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm with numerous external URIs pointing to potentially disposable hosting. While no scripts were extracted, the structure and numerous unknown URLs suggest an intent to redirect users to malicious sites, likely for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://wiltech-hk.com/editor_upload/file/26568655562.pdf In PDF document text
    • https://khyatiinfotech.biz/ckfinder/userfiles/files/50711424820.pdfIn PDF document text
    • https://am-system.eu/ckfinder/userfiles/files/75881361167.pdfIn PDF document text
    • https://skiclubraonbaccarat.fr/pdf/55072872947.pdfIn PDF document text
    • http://erulingua.hu/uploads/content_files/files/rexajenilopugumulawo.pdfIn PDF document text
    • https://fortworthdental.net/cmsCart/upload/file/pigosegiwuzuwika.pdfIn PDF document text
    • https://traicaygiasi.com/Images_upload/files/19516809886.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16130dbb03dbc2---21718283662.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/81315290226.pdfIn PDF document text
    • http://santamariamikado.com/uploads/files/49541149454.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/migukikategun.pdfIn PDF document text
    • http://internet-trade.cz/UserFiles/file/vesuledaxut.pdfIn PDF document text
    • http://purplebyanki-com.bvirani.com/ckfinder/userfiles/files/lazexikogejozuwapa.pdfIn PDF document text
    • http://showpelec.com/data/file/20210912_040229_823.pdfIn PDF document text
    • http://canvangdientu.com/images/file/dojapowisoxuwanuxawekak.pdfIn PDF document text
    • https://xn--90aoja6ahg5ds.xn--p1ai/uploads/files/fovixarupolinilu.pdfIn PDF document text
    • https://www.prieur-equipement.com/ckfinder/userfiles/files/kojanem.pdfIn PDF document text
    • https://investmentskillsgroup.com/images/userfiles/file/lapurerizazadizuvalifufi.pdfIn PDF document text
    • https://www.gryf-wet.pl/ckfinder/userfiles/files/lapobepuf.pdfIn PDF document text
    • https://manusingh.org/scgtest/eec-new/codelibrary/ckeditor/ckfinder/userfiles/files/35763313734.pdfIn PDF document text
    • http://buyyoutubecomments.com/ci/userfiles/files/49040509732.pdfIn PDF document text
    • http://xn--80akoseq9f.xn--p1ai/userfiles/file/12168882089.pdfIn PDF document text
    • https://hv2barrier.com/application/third_party/ckfinder/userfiles/files/rujezumafozejif.pdfIn PDF document text
    • http://pneusmarene.it/images/file/78165524570.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=incrementar+volumen+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_off0000bebc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEBC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d6d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6D3 10480 bytes
SHA-256: 5c3af2663306397ef2425dece000c434d803444e4d048ffe5e33d1a034b2c55b
font_02_sfnt_off0000ee96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE96 18420 bytes
SHA-256: fcf90a3098c0b8a49c2d44e65267137961439fbde335737ff0657a0d2df9c38e

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