Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ae423ec6514b987…

MALICIOUS

PDF

84.8 KB Created: 2020-12-28 20:54:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: c4cb65c84d05b4578385827b9571724b SHA-1: 910579baa2f88b6ff5dfa5e09504a88f886d7506 SHA-256: 7ae423ec6514b98795a4ce5d71d546ef6d2403b3a0479a3eba1a3aa8dc50f33a
164 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, many of which are part of a link farm designed to attract traffic, and one specific URL points to a cracked software download. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or a trojan delivery mechanism. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://trafffe.ru/aws?utm_term=autocad+2009+full+crack+free PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4367281/normal_5f97b3dd24214.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420454/normal_5fbc676d4ef73.pdfIn PDF document text
    • https://tanaxigurav.weebly.com/uploads/1/3/4/2/134266775/5476235.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422136/normal_5fc4c20c2c78b.pdfIn PDF document text
    • https://dudatagavadupim.weebly.com/uploads/1/3/4/4/134402573/juzitixaviwojew.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459464/normal_5fd94155be27c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368750/normal_5f8cc813a8ede.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450338/normal_5fa2f564eb134.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498834/normal_5fd81c4955ac5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489251/normal_5fe46569c07e9.pdfIn PDF document text
    • https://cdn.sqhk.co/zebapomiz/jRPgemX/school_teacher_application_for_teacher_job_in_english.pdfIn PDF document text
    • https://lolewifewo.weebly.com/uploads/1/3/4/7/134710585/6b5595f545832.pdfIn PDF document text
    • https://cdn.sqhk.co/xotabuti/jjYLCN7/73522205540.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca2bfcab-4507-41f3-84e9-fb55e659679d/tp_link_access_point_wireless_ac.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA9D 6832 bytes
SHA-256: 01ac34376b7092400a12f9c5b46029046d686b565a1181b560d79e3eb0283013
font_01_sfnt_off0000ebed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBED 5320 bytes
SHA-256: 37c8f1805b125e99479e864bf2f629d3f94fce4ca4993209f1c4127bd81a8584
font_02_sfnt_off0000fe14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE14 4144 bytes
SHA-256: 4b901072185e861046be14276314799fe0156b4acaf079a2b5b99d0a2912b5f1
font_03_sfnt_off00010aca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ACA 10756 bytes
SHA-256: 7229e01047dc777cd56d76d5a33510de27641cdcbfb9c6980122f4ea9f835fc5
font_04_sfnt_off00012fe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FE3 16256 bytes
SHA-256: 09eac85525e4e31cb6fd69fe554baf0bff05716ac67dd70b39d45d87f784aeaf

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