Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3c96632c29f14df…

MALICIOUS

PDF

79.0 KB Created: 2021-03-30 00:26:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 4a7497da8102cd9890771027b3bc88a4 SHA-1: b1ed4226da7f7e7f0ac561fb19f3b17bfb0c13c7 SHA-256: f3c96632c29f14df3660ebe318f191648dd40cc47c8e5a33b69fbfd51f15a990
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://botokaw.ru/strik?utm_term=what+is+wrong+when+a+dryer+won%2527t+heat PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4383146/normal_606243ca0c78c.pdfIn PDF document text
    • https://cdn.sqhk.co/dekawako/hif3ahb/67606813058.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497369/normal_601b3601043d9.pdfIn PDF document text
    • http://closemaze.com/clasificados_el_comercio_quitozzbyf.pdfIn PDF document text
    • https://cdn.sqhk.co/sipebililofo/d4Lgdf8/sonic_adventure_2_gamecube_save_file.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393754/normal_603e815352808.pdfIn PDF document text
    • http://adminhalil.com/wwe_champion_wrestling1bdhb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415769/normal_60086f2a7b26a.pdfIn PDF document text
    • https://cdn.sqhk.co/tasaxasup/xhbjbjj/polif.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484834/normal_6042035300ea0.pdfIn PDF document text
    • https://cdn.sqhk.co/kosadara/hjicfH9/jixerezeviwojob.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://4fe85328-8dbf-40e9-afa8-2c8d6ff8a9c8.filesusr.com/ugd/9c0842_e6eb2805b6524d849b864fcc6be1a8e3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tumuzu/13432907896.pdfIn PDF document text
    • https://s3.amazonaws.com/kiguteperilodu/pivovodopefonizajufifu.pdfIn PDF document text
    • https://a1d3e036-d9a1-4be1-9d2f-eedbb581cb22.filesusr.com/ugd/3ce946_ec5faf23340d4b0fa178fce3d48f16ee.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vukumesoj/zubodawaguvudurifo.pdfIn PDF document text
    • https://s3.amazonaws.com/sugowubuf/kuvewubejedibuw.pdfIn PDF document text
    • https://s3.amazonaws.com/bupesejirijejus/gewulilamezuboteb.pdfIn PDF document text
    • https://s3.amazonaws.com/tugafebip/gojomitigub.pdfIn PDF document text
    • https://s3.amazonaws.com/zubata/dutekemo.pdfIn PDF document text
    • https://99442e0c-e188-470f-b1e9-a2082f9e7f28.filesusr.com/ugd/2274a7_6f3f80e69dcc4400bad3ba09a5e50b08.pdf?index=trueIn PDF document text
    • https://a4067306-84c0-45ce-9c36-3cbb795fcb37.filesusr.com/ugd/d5b970_2f1fe8e839f547a2bbad4d435148fc4a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/divexikav/wijit.pdfIn PDF document text
    • https://081e7fb2-604d-424b-9b75-a58d54a71a44.filesusr.com/ugd/abd6ea_270a820ae8f14a67a088421fbdff79bd.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kagedatabujo/4673000041.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f84c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF84C 5296 bytes
SHA-256: 6fbc89645109614085847902827ced5f0ee5b9095357432864be4bc703187b6e
font_01_sfnt_off00010a6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A6C 10664 bytes
SHA-256: 247b7fd4e8f6756ae9bb66df9a0c2d103e3f494afe185699f698ae8abc1f65f7

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