Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b8b587febbb8668…

MALICIOUS

PDF

73.4 KB Created: 2021-02-28 22:55:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 87c4a5132ffe23f102fc43faa6b7b535 SHA-1: c8f852f06e99df04e8e49077b6d996f3aacc1fb7 SHA-256: 4b8b587febbb8668a2f2e643ceb0a6b8bf3267c33a9ca163152f7f9e791a95a5
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, many hosted on disposable domains, suggesting a link farm or phishing lure. The PDF structure and embedded content, though partially obfuscated, point towards an attempt to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://kuzutuzo.ru/strik?utm_term=the+stand+movie+2020+cast PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4455907/normal_5ff0d74d796df.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371240/normal_601abffe660dd.pdfIn PDF document text
    • http://prizinsta365.website/calma_song_mr_jattjebxa.pdfIn PDF document text
    • https://xasuzetevoke.weebly.com/uploads/1/3/2/6/132681443/zuwugop.pdfIn PDF document text
    • http://help-lnstagram-verifycopyrgiht.com/vewefovimemqhot.pdfIn PDF document text
    • https://lapolepep.weebly.com/uploads/1/3/1/4/131406498/2106714.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376374/normal_601ac47e227b8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368230/normal_5fe0709616bb3.pdfIn PDF document text
    • http://bezufosaga.iblogger.org/4494828226.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426415/normal_60090da625f0a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494891/normal_601385872986c.pdfIn PDF document text
    • https://sinipipa.weebly.com/uploads/1/3/0/8/130874509/6554740.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382952/normal_5fd8d9d7bb2de.pdfIn PDF document text
    • http://waniwukudalutef.22web.org/air_max_penny_1_performance_review.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://buzurofomurab.rf.gd/symantec_dlp_14._6_maintenance_guide.pdfIn PDF document text
    • http://nusilelopalal.epizy.com/torulig.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e22f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE22F 5332 bytes
SHA-256: 8c08bff5fccbc22687e67d16a8a9ee1827a444b0bcb17abc965a3f10e8397273
font_01_sfnt_off0000f436.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF436 10680 bytes
SHA-256: 99333234963903fbb53a9625259b36c8267c44054d9ea2b012a385c7210fe9e4

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