Malicious PDF — malware analysis report

Static analysis result for SHA-256 40bc4ed83b0e5ba9…

MALICIOUS

PDF

90.6 KB Created: 2021-02-19 02:27:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: e3f71dbbe38411ca58fa822e9a612571 SHA-1: 01e68e10cf0d714cb3789f614aab8dfd3e460855 SHA-256: 40bc4ed83b0e5ba91af4b492ef64e7e30462acdcce240d8b0f00b7a9f82b537d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, a common tactic for SEO poisoning and directing users to malicious sites. The heuristic PDF_SEO_LINK_FARM and the presence of an embedded URL pointing to 'jottigo.ru' strongly suggest this document is part of a link farm designed to attract clicks. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent, likely to lead users to phishing pages or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://jottigo.ru/wix?keyword=digital+design+using+vhdl+a+systems+approach+pdf+download PDF link annotation
    • https://cdn.sqhk.co/pemejurove/gjfsGaI/kuzatubudexebu.pdfIn PDF document text
    • https://cdn.sqhk.co/bifepupama/hhhbies/3746635714.pdfIn PDF document text
    • https://jeratevi.weebly.com/uploads/1/3/0/7/130774970/680db5.pdfIn PDF document text
    • https://cdn.sqhk.co/kavejufa/bwu7Nha/music_eq_bass_booster_volume_booster_for_pc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368951/normal_600f590d9c9c1.pdfIn PDF document text
    • https://cdn.sqhk.co/zetikitor/bjejj11/dufatut.pdfIn PDF document text
    • https://jifofavara.weebly.com/uploads/1/3/4/6/134631997/20bf97.pdfIn PDF document text
    • https://cdn.sqhk.co/xowuzaseku/37ie8gg/wijatexarinivino.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/webipejonavuv/4958934260.pdfIn PDF document text
    • https://s3.amazonaws.com/lolijexejomak/bilingual_dictionary_english_malayalam_free.pdfIn PDF document text
    • https://s3.amazonaws.com/xamibudasagas/pesoludore.pdfIn PDF document text
    • https://s3.amazonaws.com/petuzutemixuvod/jonozozatokewezemovaxi.pdfIn PDF document text
    • https://s3.amazonaws.com/fojaxexino/ketinunasalujobisanozago.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://scripts.sil.org/OFLIn 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_off000102ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102EC 5824 bytes
SHA-256: 6624ba71f4e260605f61c016e63c486918d0145f4ff760b65c47950cedc7ee11
font_01_sfnt_off000116b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116B8 15644 bytes
SHA-256: ce7f999a074928749abb545626c498be78267ecc0eca9a2189e98d1f426e3acf
font_02_sfnt_off00014767.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14767 16280 bytes
SHA-256: c204abc72913d2288c7e7cd549120d24d9eeb3cf7691da187b56875ce8d02bc1

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