Malicious PDF — malware analysis report

Static analysis result for SHA-256 16631e41db1d8035…

MALICIOUS

PDF

89.1 KB Created: 2020-11-11 10:52:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 9b3925321e799f8934087599eeb591c0 SHA-1: de2e732f00735c61c451064dbd1649a5748c93db SHA-256: 16631e41db1d80358c951cf3a371ca85b17802add3ead45791d8899bc78606e7
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://trafficel.ru/strik?keyword=super+express+bullet+train+rulings PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4370076/normal_5f9573a8b9edf.pdfIn PDF document text
    • https://gabejopow.weebly.com/uploads/1/3/4/5/134597712/f2a337d5799068f.pdfIn PDF document text
    • https://kizekusoviwo.weebly.com/uploads/1/3/1/4/131453028/jewajiwokuwokip.pdfIn PDF document text
    • https://sejejuno.weebly.com/uploads/1/3/4/4/134447194/runotew.pdfIn PDF document text
    • https://gilasagajeradek.weebly.com/uploads/1/3/4/6/134632792/88309.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373526/normal_5fa4b406f345e.pdfIn PDF document text
    • https://xoxaworik.weebly.com/uploads/1/3/4/0/134012931/fbe378047.pdfIn PDF document text
    • https://jalewigevat.weebly.com/uploads/1/3/2/6/132681207/3324948.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367645/normal_5f88c1dc3d364.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/16d3e629-ac4c-466f-8c4b-4e751b0e47e7/bookcase_zoom_virtual_background.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50e42308-5d48-4f05-ab83-4d9bd09c8b20/botw_energetic_rhino_beetle_farming.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e6cbf5a-90fa-4557-9cac-e07744aaff2e/30320674874.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d6e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6E7 15852 bytes
SHA-256: 1af5508bbf3ebdc24a88a89f6a343e18f9dafd9fbea536dc8415dcc8ef51d6aa
font_01_sfnt_off000107df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107DF 5300 bytes
SHA-256: e95f49431e93b4648f6c9fc014643f4f7e0a49a0028535d8be963f9eacf7ea9f
font_02_sfnt_off000119ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119EE 11964 bytes
SHA-256: edbdb4ad520f5ae2bffa7f14e4950f3e8d5320acc0b32876a7b06cc4102008d6
font_03_sfnt_off0001415d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1415D 16312 bytes
SHA-256: 531e37f64a2e7dc3bfb257675d9e6c644c7b1597f33ba9a969cd005a7ed65660

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