Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f58298b0f7efee3…

MALICIOUS

PDF

98.3 KB Created: 2021-03-25 03:41:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 072e78d492794cb40ed82d86d2975a58 SHA-1: dbdf712c59cf28aae44ffd72fdf9a61b9603d67b SHA-256: 0f58298b0f7efee39fd0373d5d56e19eab1cfa070a24bd702bd9a09f3d607036
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable hosting, suggesting a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://kuzutuzo.ru/wix?keyword=jensen+alarm+clock+radio+manual PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4447265/normal_603b31550911e.pdfIn PDF document text
    • http://zuwigef.22web.org/spb_balasubramaniam_songs.pdfIn PDF document text
    • http://dubifuxukev.iblogger.org/diditumugogar.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424953/normal_60104b0864ccf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424009/normal_603e6c671c4e4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465548/normal_5fc5af7e9fbfe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417523/normal_5fea189ef0538.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367646/normal_5fd5f4036972e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422637/normal_6008a4217916c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413567/normal_5fd39e623f980.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383170/normal_5fe291f141349.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372087/normal_600e01862b1cf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379726/normal_5fdc0312289ed.pdfIn PDF document text
    • http://wugosuguzef.22web.org/sample_safety_plan_osha.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373243/normal_6031fb013accb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380223/normal_602dd43cd12f5.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bavajusap.rf.gd/57668719562.pdfIn PDF document text
    • http://mibarup.epizy.com/onedrive_android_sync_files.pdfIn PDF document text
    • http://ribaxekag.epizy.com/96551456964.pdfIn PDF document text
    • http://zetafilutebes.rf.gd/afcat_exam_paper.pdfIn PDF document text
    • http://lulorabero.epizy.com/23790990198.pdfIn PDF document text
    • https://37cc4ef3-276f-49d0-84f3-8bc08bbde6a9.filesusr.com/ugd/e4a5d4_1be67bbbf2e94be8aeacfada3ba1f6ad.pdf?index=trueIn PDF document text
    • https://b01ec662-dec5-4f54-b977-8708717d6054.filesusr.com/ugd/07e02c_aa69e45b934740e0a5c98cd9a8ecff29.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001242b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1242B 1768 bytes
SHA-256: 61220a0dae34d1298b72f9dc29e84aaedfd295c424e610d0b93cf322ab2cb80f
font_01_sfnt_off00012cd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CD2 5140 bytes
SHA-256: 2fcd0bf880e93b0486dc13c2c7386df5abeb3055574025bc83dbe696cb6d7f0e
font_02_sfnt_off00013e33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E33 11688 bytes
SHA-256: d2cf87023df02078d3483d515a7b805ebc9aa39472745f2e9c775f08ae7aba85
font_03_sfnt_off00016660.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16660 16060 bytes
SHA-256: 2173a1880e9f774f759393e7d0d28dda91d04d8a3eae6bea41b822770b343b90

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