Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6377c33481ba9a5…

MALICIOUS

PDF

84.5 KB Created: 2021-04-30 20:13:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 3c2a7d517aca633470841486c4d0ba84 SHA-1: dd12cc825fe14af0ddbd40da3019f87f22edcf42 SHA-256: c6377c33481ba9a5f73cc7284818dc78916573d51c32027c311dc081799742f6
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically identified as a phishing trojan by ClamAV. It contains numerous embedded URLs, many hosted on disposable domains, indicating a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, suggesting it was generated programmatically to serve as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jumiwimov.ru/strik?utm_term=does+qigong+healing+really+work PDF link annotation
    • https://ribigitapupag.weebly.com/uploads/1/3/4/8/134887221/silovibugon.pdfIn PDF document text
    • http://gadatoreneperil.mygamesonline.org/23666495248.pdfIn PDF document text
    • https://bexipame.weebly.com/uploads/1/3/0/7/130776855/nowiwuliworajur_tobizutan_nedexo_zegizabiriti.pdfIn PDF document text
    • https://vefutafefu.weebly.com/uploads/1/3/4/8/134882527/d1fc7f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464730/normal_5feed756acfa0.pdfIn PDF document text
    • http://pifumufupes.iblogger.org/school_supplies_worksheet_for_preschool.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487918/normal_6038f0c69618b.pdfIn PDF document text
    • http://saniwigudovo.scienceontheweb.net/bootstrap_3_documentation.pdfIn PDF document text
    • http://ratixopawem.mypressonline.com/cancer_espinocelular.pdfIn PDF document text
    • https://rijozixofufake.weebly.com/uploads/1/3/4/5/134509282/tedibare.pdfIn PDF document text
    • https://jetezoxow.weebly.com/uploads/1/3/1/3/131379231/6849828.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481418/normal_6026dd8c0351a.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/tobojelusiwi/mathematics_for_economists_pemberton_and_rau.pdfIn PDF document text
    • https://s3.amazonaws.com/jukezeluf/56004444524.pdfIn PDF document text
    • http://zupamifub.rf.gd/sovalaf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0506cc9a-b63e-441d-95c8-30ecda247d2b/1881192602.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9c69f59-5ef2-4cd2-a0a6-b7bd59f0fdd9/vajowurebazemefas.pdfIn PDF document text
    • http://pulovuvaf.epizy.com/sensory_system_examination.pdfIn PDF document text
    • https://s3.amazonaws.com/gonasidupij/kenmore_ultra_wash_3_portable_dishwasher.pdfIn PDF document text
    • https://s3.amazonaws.com/kovozenamofox/visual_studio_code_python_format_on_save.pdfIn PDF document text
    • https://s3.amazonaws.com/getizar/sph_da120_pioneer.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f827.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF827 5332 bytes
SHA-256: a1372ed0298c07935bc0c3c6d61be5c6dc315ac69e9141ed30125807b4280bcf
font_01_sfnt_off00010a5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A5C 10768 bytes
SHA-256: 02593d038ee7c60833d395ab2cce7c12042531cc8c2d6305ef644093d2e01131
font_02_sfnt_off00012f6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F6B 16060 bytes
SHA-256: 99ddc6f5858eb134f8024171ebe717cbd02485c31471b921a5021903b5272953

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