Malicious PDF — malware analysis report

Static analysis result for SHA-256 b30b8af1d3505ddb…

MALICIOUS

PDF

73.2 KB Created: 2021-02-14 03:40:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: b6741b9505097f766beb840ec88a3678 SHA-1: 62b9668c17edf05efb3973bf524bd68a83f92fdf SHA-256: b30b8af1d3505ddbc41a05199af8b1ba0fef375e3edc373637a98464830199fd
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying it as a link farm. The primary URL, 'https://seumenha.ru/wix?keyword=graphing+absolute+value+functions+inequalities+worksheet', suggests a lure related to educational content to mask malicious intent. The ML classifier and ClamAV detection strongly indicate maliciousness, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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://seumenha.ru/wix?keyword=graphing+absolute+value+functions+inequalities+worksheet PDF link annotation
    • https://teduraxiwerul.weebly.com/uploads/1/3/2/6/132681384/8390105.pdfIn PDF document text
    • https://disovipogazita.weebly.com/uploads/1/3/1/3/131398104/zoduru.pdfIn PDF document text
    • https://cdn.sqhk.co/dibitarebizu/LYhgeje/learn_english_grammar_app.pdfIn PDF document text
    • https://cdn.sqhk.co/nudofarus/Nghd8ih/vazatinif.pdfIn PDF document text
    • https://cdn.sqhk.co/movijomo/joghbj1/strikemaster_mora_ice_auger_blades.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366028/normal_6015715ec1673.pdfIn PDF document text
    • https://mubonunegaj.weebly.com/uploads/1/3/0/8/130874179/4552979.pdfIn PDF document text
    • https://gimiduti.weebly.com/uploads/1/3/4/7/134711596/9029172.pdfIn PDF document text
    • https://bexukisutiso.weebly.com/uploads/1/3/0/8/130873741/pegug_morefuwipezano_pukako.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455174/normal_60121814bd0c0.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/xuvamuba/kafoxiwudomo.pdfIn PDF document text
    • https://s3.amazonaws.com/nazekisigiduz/vipimevakubodudeviko.pdfIn PDF document text
    • https://s3.amazonaws.com/leributafa/39586294866.pdfIn PDF document text
    • https://s3.amazonaws.com/faduxodiwo/magazine_design.pdfIn PDF document text
    • https://s3.amazonaws.com/vukusa/balezesixelizetujew.pdfIn PDF document text
    • https://s3.amazonaws.com/sefabe/pazewuziferapivapefadu.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_off0000de35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE35 5792 bytes
SHA-256: eb157ec0536841e0725b87f403f4db8854642be12f7cf79f5351ab7ec806925d
font_01_sfnt_off0000f1ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1FF 11504 bytes
SHA-256: 29873887b7ed19854816587a61b5a1968c425886409ed1299f56a2a7fac48181

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