Malicious PDF — malware analysis report

Static analysis result for SHA-256 d063d9d7931f6eef…

MALICIOUS

PDF

80.9 KB Created: 2021-03-12 18:45:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 960a39a1c2023fa61cb5544b31d413de SHA-1: 06976d91019cabe7ad207972a7109f3eefc68285 SHA-256: d063d9d7931f6eefd1e685bb4b315144d95c4d5d5efd327339b8f3210e1ea30f
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a ClamAV detection and an ML classifier. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO poisoning tactic. One prominent URL, 'https://baarspo.ru/award?keyword=interview+questions+for+bca+freshers+pdf', indicates a lure related to job interview questions, likely intended to direct users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://baarspo.ru/award?keyword=interview+questions+for+bca+freshers+pdf PDF link annotation
    • https://kozewililusu.weebly.com/uploads/1/3/4/0/134013002/buvotatebevos.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477401/normal_6028ecf6e331a.pdfIn PDF document text
    • https://pujuwofox.weebly.com/uploads/1/3/4/8/134882524/jebemufeveb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392193/normal_600b67506ff60.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454672/normal_60321a726964f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374682/normal_6025aa753f05a.pdfIn PDF document text
    • https://newewakezodem.weebly.com/uploads/1/3/4/6/134680802/xixubupo_xapogijef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495525/normal_5fd9359551aae.pdfIn PDF document text
    • https://kogevinipuban.weebly.com/uploads/1/3/4/5/134514077/lanamujapuv-piwuxawelu.pdfIn PDF document text
    • https://mesofuxemivoge.weebly.com/uploads/1/3/1/3/131398024/welijebi-zotigopasol-juborufitax-bafobotajuxem.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384039/normal_60149ee264bfe.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://d1159ab4-cbf5-42eb-897b-83a5e94cd7da.filesusr.com/ugd/536122_ddec4e05fbc64643b22867cec32f6f75.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a84f55e1-bef9-4cbb-90f4-a246423fb60e/12399538958.pdfIn PDF document text
    • https://19a39513-20cc-49d1-a75c-e30ce0314142.filesusr.com/ugd/f99735_fa9562f06305478d9d9a7fa8221779ff.pdf?index=trueIn PDF document text
    • https://21319658-e817-4d6a-846f-872ccfe0f0c2.filesusr.com/ugd/982af2_d1812ab4ee8b46babc21e7e75331af15.pdf?index=trueIn PDF document text
    • https://f13dd0f9-fe0a-4257-a88d-d9af1a1cf0e3.filesusr.com/ugd/d954c5_4d602fe9db2c4b6dae286d189d558fce.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/000b36e3-6378-4152-8ddf-44ebb5f3f279/gevexunulevenokafidifi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df10c160-b405-4fd8-b67f-32f5a7a79768/how_to_record_on_tascam_dp-02.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C5 5448 bytes
SHA-256: 8ea5ab659a08c2d7021c5b1dc556a4b2559efd5af4e3d9bebaa7dfdf6bb4170c
font_01_sfnt_off00010451.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10451 10488 bytes
SHA-256: b9d3c3abfde8369842364715a9a7cc3b7a479895258dc39a63157c99286f326f
font_02_sfnt_off00012821.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12821 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176