Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ac08d6abed8daba…

MALICIOUS

PDF

87.8 KB Created: 2021-04-08 04:58:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: df2125098cce5790c4eb384d036f6e33 SHA-1: 5795547c06eca1c97c2447ddda6628e592eb1257 SHA-256: 7ac08d6abed8daba9293fb3d9f55688cb1cfb22a97c1d8d6f8ebd6a8182e21af
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 0.9997

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://resalured.ru/123?utm_term=algebra+1+placement+test+answers PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4446016/normal_60028a0f5a6ad.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411916/normal_5fcb4f80c28c1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389108/normal_602588cc53481.pdfIn PDF document text
    • http://neroveruturom.iblogger.org/monohybrid_and_dihybrid_practice_problems_answers.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446772/normal_603e291dc6460.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450638/normal_602f450b87c34.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500882/normal_60068f0ac80c7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375197/normal_6042e7648314c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495413/normal_5fd3267525399.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468530/normal_600b1497b071c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377663/normal_5ff928233a7d0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369164/normal_605582fa9d30f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480579/normal_60379f2b0a8cd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409396/normal_6057e588643a0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427103/normal_601d9b6e499e2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pimifemegizak.epizy.com/96428963099.pdfIn PDF document text
    • https://da18e6a8-d720-42de-a88c-3f13daad7efb.filesusr.com/ugd/08fe48_d1314d6a5153455eab35997e8a98aae7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2156c77d-ae78-46f5-a8f9-08c8fbf77440/milady_standard_cosmetology_2012_online_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2bcf9371-664f-433e-a11f-88e5f0b98d68/58623020790.pdfIn PDF document text
    • https://f6e2a16f-d004-42cd-8f17-0463e090774c.filesusr.com/ugd/c70c35_2c26fdf15ee748dbbbddd828ef326b4b.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eceb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECEB 5524 bytes
SHA-256: 4a065041430f778b3020784bcf7a374efa2abd0573e039b32032f59a5e43a4a9
font_01_sfnt_off0000ffb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB4 20568 bytes
SHA-256: 7d097bf074f20538d27803228e969f345bb39519087020ad44b49ef447bb4657
font_02_sfnt_off00013b3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B3A 16088 bytes
SHA-256: 9b1148babf9e53f7281b982efac3d21c1a74094b534bd71b1e866d856b9467d7

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