Malicious PDF — malware analysis report

Static analysis result for SHA-256 934b3d11e1f9d9a4…

MALICIOUS

PDF

84.3 KB Created: 2020-12-07 08:40:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 41492898f2209daf0166493883cd0885 SHA-1: b8e9ac3dbfcab5ea7e4675e95212f74b5008e541 SHA-256: 934b3d11e1f9d9a4a1c57b3c8c2bcfa44084ea1bc4282b2729aeb646a2843cd8
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 0.9994

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 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://trafffi.ru/strik?utm_term=sd+maid+pro+cracked+apk+free+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4367632/normal_5f95482df35eb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386849/normal_5fbebb60efaef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380219/normal_5fa1bc8eaa0af.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483070/normal_5fb8cfc567788.pdfIn PDF document text
    • https://lulitetuxopibol.weebly.com/uploads/1/3/1/1/131164377/4f3ddaa63a56a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480753/normal_5fcb08e723514.pdfIn PDF document text
    • https://ropugobefele.weebly.com/uploads/1/3/4/4/134445072/aaece0887c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/0ac1e193-80db-400a-9d70-9371506bccc2/economics_of_energy_and_environmental_policy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aaf14df1-644f-4c8e-b7d8-35956f7a3d99/march_john_lewis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a3f56f7-c9e9-4d34-a34c-1aff2128e0d8/methanol_test_strips.pdfIn PDF document text
    • https://s3.amazonaws.com/fadedosi/payroll_audit_procedures.pdfIn PDF document text
    • https://s3.amazonaws.com/kagedatabujo/capital_city_quiz_questions.pdfIn PDF document text
    • https://s3.amazonaws.com/vuxagixil/baby_business_cards_templates_free.pdfIn PDF document text
    • https://s3.amazonaws.com/jufowokedunod/encyclopedia_books.pdfIn PDF document text
    • https://s3.amazonaws.com/didowugorokirug/99683262742.pdfIn PDF document text
    • https://s3.amazonaws.com/bubisifapagefe/vitanefegakiziposa.pdfIn PDF document text
    • https://s3.amazonaws.com/niwotipugonuvoz/ableton_live_user_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/342a2b8d-897d-4f77-89dc-5296a11bb714/73614902366.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB94 5088 bytes
SHA-256: b40ded492d806584e85b11be6991626bae160c55bcafbee67f65f5d312220fbc
font_01_sfnt_off0000ecc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC8 3036 bytes
SHA-256: 3d11c8f700551d7ebd826ba7500314f7cad5b016ea1c4095387e37a234d18979
font_02_sfnt_off0000f95a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF95A 10716 bytes
SHA-256: b78eec21c40169812f1e2e4221ec27ef3c21f04cdcc0a751c0b069a584cf169b
font_03_sfnt_off00011e39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E39 16672 bytes
SHA-256: a26a6f6f3df2c07d1e971bcaff94607f73a47ac852c1530dfcb1043d1b740844
font_04_sfnt_off0001349d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1349D 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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