Malicious PDF — malware analysis report

Static analysis result for SHA-256 b30e73525b0717f4…

MALICIOUS

PDF

73.2 KB Created: 2021-03-01 22:51:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 290df54b1e6f58f2b1c4c92ef2578e92 SHA-1: 7af649bbe60656c7c5ee07c8e5e68f269e928bb9 SHA-256: b30e73525b0717f40aa6d95ed06626c45c8a9fdf09c602fee0e4a5cffc9be1bf
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which are part of a link farm designed to manipulate search engine results. The primary URL suggests a phishing or SEO scam related to mathematical operations. ClamAV and ML classifiers strongly indicate malicious intent, specifically a phishing trojan.

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/award?keyword=what+is+the+correct+order+of+operations+for+solving+equations PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4405467/normal_602453b9698f6.pdfIn PDF document text
    • https://dizufarul.weebly.com/uploads/1/3/1/3/131379939/2148736.pdfIn PDF document text
    • http://larebalin.mypressonline.com/1_8_architectural_scale.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371812/normal_5ff061ed11054.pdfIn PDF document text
    • http://remont-pc.website/90023512862wt4d4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388598/normal_5fd608ed1a60d.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/zuniverijesud/87069680102.pdfIn PDF document text
    • http://novepajosebuji.rf.gd/43950280111.pdfIn PDF document text
    • https://s3.amazonaws.com/difigomisosak/favoured_nations_the_setup.pdfIn PDF document text
    • http://wazarirub.rf.gd/dilations_five_pack_worksheet_1_answer_key.pdfIn PDF document text
    • http://gosaduzunake.myartsonline.com/que_significa_taller_en_espaol.pdfIn PDF document text
    • https://s3.amazonaws.com/patilawasu/vunubub.pdfIn PDF document text
    • https://s3.amazonaws.com/suzujewa/51441175802.pdfIn PDF document text
    • http://xupudajiwozov.epizy.com/15855094847.pdfIn PDF document text
    • http://nubuwij.epizy.com/air_pollution_introduction_for_project.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_off0000deb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEB6 5616 bytes
SHA-256: 1298b15b398d18a82733e65172fe085b42b6c782c67b766dcd2f99aeedbfc42f
font_01_sfnt_off0000f1d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D8 10948 bytes
SHA-256: e99683f27e1bb586b5d45a9880dc2966216686bf03e0c41273187fc4b8655917

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