Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ca716d73399bd37…

MALICIOUS

PDF

87.5 KB Created: 2021-04-01 14:04:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 1d0f4d35405f4b9b8a54bd3fd0d9e69b SHA-1: f2a2c5bd72c08d084ee2580b018dadf537847491 SHA-256: 3ca716d73399bd373f59eb01ab5da2946349c7fd953e223b3fb2a835c4da7e8f
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or redirection scheme. The embedded URL and the document body, though heavily obfuscated, point towards a lure related to specific book searches. ClamAV detection and ML classification confirm its malicious nature, likely as a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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/award?keyword=ap+grama+sachivalayam+books+in+english+pdf PDF link annotation
    • http://perfectiona.online/best_cbt_workbook_for_anxietyh2d4k.pdfIn PDF document text
    • http://paxejunon.mygamesonline.org/mumalebubajununoxazodili.pdfIn PDF document text
    • http://pro-komp-master.website/zujuserunagpqoj.pdfIn PDF document text
    • http://vostokzapad.su/what_does_the_abbreviation_cis_stand_formexsj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387938/normal_604d3a4e148b7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403119/normal_604fe9103b067.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407810/normal_6031e6316fd45.pdfIn PDF document text
    • http://kogejirupu.getenjoyment.net/18746366633.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458407/normal_6061389db959b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390055/normal_6023f9e4c7b7e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://s3.amazonaws.com/wuzalugiseto/47395879513.pdfIn PDF document text
    • https://s3.amazonaws.com/vigevot/chick_fil_a_franchise_cost_reddit.pdfIn PDF document text
    • https://s3.amazonaws.com/dewutexorob/thinking_out_loud_full_hd_video.pdfIn PDF document text
    • https://s3.amazonaws.com/jewizopukuni/what_is_the_opposite_of_inverse_tangent.pdfIn PDF document text
    • https://d4cba69e-f3c5-4a64-9e40-69ba24924691.filesusr.com/ugd/b73feb_7ad7be72c99b4c038b06fc8787066dfd.pdf?index=trueIn PDF document text
    • https://fae5df41-d68b-4d62-9961-cd33801cec7e.filesusr.com/ugd/f52c73_97179e5cb9814e78a1ee79b0a154fb5b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/babuxufarizuxur/who_are_jacks_biological_parents_in_the_importance_of_being_earnest.pdfIn PDF document text
    • https://s3.amazonaws.com/toliwudalamem/13069675889.pdfIn PDF document text
    • http://gemawinikifiv.myartsonline.com/lopelajup.pdfIn PDF document text
    • https://f9c81679-ddb1-4746-ab40-32673edc426c.filesusr.com/ugd/2eff39_942462e34984485f80261223d3e0bffa.pdf?index=trueIn PDF document text
    • https://b1b0174c-961c-4936-87f6-765e1132391e.filesusr.com/ugd/6cf804_8a3aa087097c490aa985ee21b4319623.pdf?index=trueIn PDF document text
    • https://b9387e75-0942-48a6-8a47-0bd3f0224277.filesusr.com/ugd/fc485c_c4a4b24a7c7e4c74a16022cdee395d79.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xukonakefules/lipenutinadugegipi.pdfIn PDF document text
    • http://sabiwilurase.atwebpages.com/lorovawe.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD1C 5924 bytes
SHA-256: d21744ed7e63a382bfac867d0a5b33d85028a5d9726af2fb3cf7b13384825cb6
font_01_sfnt_off00011132.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11132 8312 bytes
SHA-256: a2f58882aa570be446195357ce1e274468e5f4e4db51818022a488269a57af8a
font_02_sfnt_off0001298b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1298B 11156 bytes
SHA-256: 970221bb93a88b871dc424008204fa95b19c008f49ca246f04b398e69d1bc378

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