Malicious PDF — malware analysis report

Static analysis result for SHA-256 a282cc423afca1e9…

MALICIOUS

PDF

78.0 KB Created: 2021-03-14 06:42:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 0b34458f195ef04cb20aad5c7f222f52 SHA-1: 68f277826ed6bf1c276c6b852489cdf875d3a88e SHA-256: a282cc423afca1e9ad15c1a69292cf002036ece283cd6bd0789c92626609fb6a
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are part of a link farm, suggesting a SEO spam or phishing campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 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.
  • 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://soxebez.ru/wix?keyword=sensation+and+perception+quiz+answers PDF link annotation
    • https://dakufosaxem.weebly.com/uploads/1/3/4/7/134771611/vusikavuni-zuwarajituve.pdfIn PDF document text
    • https://kevapesezivobi.weebly.com/uploads/1/3/4/8/134893959/bc93b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486971/normal_602ac2dcdd265.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417321/normal_600bfd3aa46e4.pdfIn PDF document text
    • https://cdn.sqhk.co/rejibebadit/cdkjdih/subway_surfers_online_play_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467019/normal_602f1fd9ea2dd.pdfIn PDF document text
    • https://cdn.sqhk.co/riwaxagi/gsohct5/zakafuvizuvilupeva.pdfIn PDF document text
    • https://fegovelusilefu.weebly.com/uploads/1/3/5/3/135330230/jejiwinatazobe.pdfIn PDF document text
    • http://vaxitowozi.iblogger.org/pregnancy_and_childbirth_stages_worksheet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465704/normal_603e2a5198ced.pdfIn PDF document text
    • https://cdn.sqhk.co/visobipibe/gS0YJig/download_game_fruit_ninja_free_mod_apk.pdfIn PDF document text
    • https://bemetezebore.weebly.com/uploads/1/3/4/8/134882820/vigeror-fojovor-lovilefuj.pdfIn PDF document text
    • https://baripunasese.weebly.com/uploads/1/3/4/1/134131446/7d0d2d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373271/normal_5fd7dc4c87849.pdfIn PDF document text
    • https://cdn.sqhk.co/tajixixejafi/fCibgjZ/9062200213.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/panalipolifod/mabojazewo.pdfIn PDF document text
    • https://s3.amazonaws.com/setigafat/40393759021.pdfIn PDF document text
    • https://s3.amazonaws.com/genijusemu/reformas_borbonicas_sociales_de_la_nueva_espaa.pdfIn PDF document text
    • https://s3.amazonaws.com/wiwuxot/1399958139.pdfIn PDF document text
    • https://s3.amazonaws.com/gopifu/polynomial_long_division_worksheets_with_remainder.pdfIn PDF document text
    • http://donovebar.rf.gd/tazawafenesa.pdfIn PDF document text
    • https://s3.amazonaws.com/xarojapi/tasozaxivakasujidamujose.pdfIn PDF document text
    • http://nujomunoza.rf.gd/pejeropatizuj.pdfIn PDF document text
    • https://s3.amazonaws.com/bisiku/50097999879.pdfIn PDF document text
    • http://rojajep.epizy.com/passport_application_form_canada.pdfIn PDF document text
    • https://s3.amazonaws.com/numunenoji/jekederupideziz.pdfIn PDF document text
    • https://s3.amazonaws.com/rogugagatuf/51511994049.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_off0000f0dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0DC 5404 bytes
SHA-256: 560da8c71e555f87f7c576e8bec2943bf9aebe3949552874d41c74a3ec0f1e5f
font_01_sfnt_off00010362.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10362 11128 bytes
SHA-256: a42dd6292d5343196cc69bdf636f3f01a867b780660babf235ab0a6b915b511c

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