Malicious PDF — malware analysis report

Static analysis result for SHA-256 59351e12ee9b6d09…

MALICIOUS

PDF

72.5 KB Created: 2021-01-24 10:55:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: f22e5a7442b5ec0717899935de03791d SHA-1: f1c929b6502a3e76caa1f7108a1d6d4cd905034c SHA-256: 59351e12ee9b6d09ac36f3335926769dc2c2dfa0be5d724be0f4359fb9df4cfa
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains embedded URLs and is flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. The document body, though heavily obfuscated, suggests a lure related to medical guidelines. The presence of numerous external URIs, some on disposable hosting, indicates a phishing or redirection attempt to a malicious site.

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 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://jacksth.ru/aws?utm_term=guidelines+for+urine+sample+from+catheter PDF link annotation
    • http://andyhong.blog/rolling_stones_logo_black_and_whitenkncd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495034/normal_5fd85a424a9b1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417543/normal_5fd63c140f967.pdfIn PDF document text
    • http://momijuluxesapek.iblogger.org/vabexodegalinekidamikawi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501233/normal_5ff30fbd757dc.pdfIn PDF document text
    • http://manekobe.22web.org/37570454627.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gavapozalilup/kho_kho_game_score_sheet.pdfIn PDF document text
    • http://merekum.rf.gd/82527740921.pdfIn PDF document text
    • http://godorapibiveze.epizy.com/tanewivitezujofexavekol.pdfIn PDF document text
    • http://xinudigiwuwa.epizy.com/zurajiziputosufi.pdfIn PDF document text
    • http://zudosikewemer.epizy.com/functional_resume_template_australia.pdfIn PDF document text
    • http://puwojewemuxa.epizy.com/xobemajulonububi.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_off0000e0ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0AB 5428 bytes
SHA-256: d5083eeda028d691f26ddaa078d67cb3132c7609dedb78c43ae112b35c63213f
font_01_sfnt_off0000f2f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F3 10052 bytes
SHA-256: e6bfce9ef40faac252f1736c99616bcbfd3f97ee872ff4f256bc00e0deda43b8

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