Malicious PDF — malware analysis report

Static analysis result for SHA-256 e141621ee82b5a2e…

MALICIOUS

PDF

79.1 KB Created: 2021-02-20 19:13:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 94777e7c0bc3feb42eb0ed68f77ba7bd SHA-1: 8d62e24b3be56d22ccceeb859735cabb63c1fc6b SHA-256: e141621ee82b5a2eaae2bfb7cda03d6ea23b950b44d04d8b75bf41bca2e153d8
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, with one heuristic specifically identifying a 'PDF_SEO_LINK_FARM' suggesting a tactic to distribute malicious content or phish users. The presence of embedded URLs further supports this, as they likely lead 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 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://leonvi.ru/wix?keyword=cstephenmurray+gravity+answer+key PDF link annotation
    • https://timifuxi.weebly.com/uploads/1/3/4/6/134676324/kumaruguxigulod_daminalosu_kokisabuvotak_kujutakuw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446400/normal_6006f231725bf.pdfIn PDF document text
    • https://cdn.sqhk.co/davusegeb/jdhhwRc/ludiga.pdfIn PDF document text
    • http://xifomepivuxena.iblogger.org/massage_chair_3d_model_free.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/xasovewipeje/autoresponder_email_template.pdfIn PDF document text
    • https://s3.amazonaws.com/fotojipifuzitul/video_audio_converter_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/tisegovofu/85394822317.pdfIn PDF document text
    • https://s3.amazonaws.com/zumomasugipeno/88110327437.pdfIn PDF document text
    • https://s3.amazonaws.com/luxelula/64958845301.pdfIn PDF document text
    • https://s3.amazonaws.com/fexuror/endocarditis_treatment_guidelines_2017.pdfIn PDF document text
    • https://s3.amazonaws.com/zarevizebi/rotixuxalofised.pdfIn PDF document text
    • https://s3.amazonaws.com/tamobalasu/adoramus_te_palestrina.pdfIn PDF document text
    • https://s3.amazonaws.com/vatosolikijike/kofekabekuvejesu.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_off0000f966.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF966 5424 bytes
SHA-256: 5db1d70c96475c753d253ff3de29b283dd144a3250a2ff783ad45ae6b36b61a6
font_01_sfnt_off00010bc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BC9 10372 bytes
SHA-256: f8541c2530e3eba5a985956fc62c8028bad0f8cc4a275b56abbd59ad575233ed

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