Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c80f453c3ae6fe4…

MALICIOUS

PDF

90.0 KB Created: 2021-03-30 03:10:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: c63bb40aea56d13d27cafe6467938373 SHA-1: 0899410e6b79bf228b27eaeda1ab7a886f5e24b5 SHA-256: 4c80f453c3ae6fe4f91c90858d544ac5e385737835b5323462afb173c87f82af
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, with several pointing to disposable hosting services and one specifically to a URL containing a keyword search that appears to be a lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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/award?keyword=tactics+for+listening+audio+script+pdf PDF link annotation
    • https://kiziwovoxapi.weebly.com/uploads/1/3/4/6/134617524/2651333.pdfIn PDF document text
    • http://zujirekirel.22web.org/pepewakonavetonutosoven.pdfIn PDF document text
    • https://wumupokurura.weebly.com/uploads/1/3/0/7/130776197/5807529.pdfIn PDF document text
    • https://mimuromujalu.weebly.com/uploads/1/3/0/7/130739347/lesosarapisuma_bigedulamamerav.pdfIn PDF document text
    • http://degitowexara.iblogger.org/camp_dutch_oven_recipes.pdfIn PDF document text
    • http://puwedubunojevak.22web.org/rodak_s_hematology_clinical_principles_and_applications.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479679/normal_5ff597af94534.pdfIn PDF document text
    • https://linugezi.weebly.com/uploads/1/3/4/2/134265501/vozelumutigarujibog.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372955/normal_6031ae0212837.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366984/normal_601b9f4c93518.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/c55dc30a-d918-4250-a046-fdb07b6cd64f/64871954723.pdfIn PDF document text
    • http://bezegorev.epizy.com/anti_discrimination_commission_queensland_annual_report.pdfIn PDF document text
    • http://molagisonapem.epizy.com/lagigivefolomuzaziguz.pdfIn PDF document text
    • https://438e95ed-c264-4db5-88d3-1a9ca8b91b86.filesusr.com/ugd/733c1f_f70e5878523a42a89f2dfa05d63f168f.pdf?index=trueIn PDF document text
    • https://e114ad41-1367-46fe-a5fd-427bf640f69d.filesusr.com/ugd/a63c55_8b7672314ce245a6a8b756090acd3644.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d1ccb1d-8e89-46ce-902d-ab61b9f3dfef/40488498794.pdfIn PDF document text
    • http://ribizotujigotok.rf.gd/sebumoj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c9d859d-de33-48cc-810c-19c23760e0d9/55794770077.pdfIn PDF document text
    • http://fexewagesulel.epizy.com/65317291043.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_off00011a7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A7B 5272 bytes
SHA-256: 43ba49ca2c1b279f78558d11e962f3dc8860d0b5fbf0357f31e2ce165c24b732
font_01_sfnt_off00012c73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C73 15800 bytes
SHA-256: 48e589ead7af3c234e3aa0dbbfac5f4d411d0f3126ddc1d25d2fb6604d00fa24

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