Malicious PDF — malware analysis report

Static analysis result for SHA-256 98ace303e3af724b…

MALICIOUS

PDF

74.6 KB Created: 2021-04-01 23:27:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 3d2a182f59798c304cdf9e781e9c9282 SHA-1: 98722d1c964345e120fa8272762ca1660010f77f SHA-256: 98ace303e3af724bf353146f168ad56e75e4d6dd2b610c1f9b68e7ee0e83930b
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are SEO-optimized and point to other PDF files, indicating a link farm or distribution network. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of malicious activity.

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 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://jacksth.ru/award?keyword=causative+verbs+exercises+pdf+with+answers PDF link annotation
    • http://zaxevef.getenjoyment.net/18431795939.pdfIn PDF document text
    • https://fokutape.weebly.com/uploads/1/3/2/8/132814024/b8170749.pdfIn PDF document text
    • http://xufopizaxeto.medianewsonline.com/weissbluth_atoms_and_molecules.pdfIn PDF document text
    • https://rokolumer.weebly.com/uploads/1/3/0/9/130969153/3897775.pdfIn PDF document text
    • https://nokesopupikes.weebly.com/uploads/1/3/4/7/134767934/puwelinuv.pdfIn PDF document text
    • http://tikopariwoxa.mygamesonline.org/vudidej.pdfIn PDF document text
    • http://sepukolobu.sportsontheweb.net/sedra_smith_microelectronic_circuits_6th_edition_solution_manual.pdfIn PDF document text
    • http://gaximivotekole.mypressonline.com/siwifufekuwapos.pdfIn PDF document text
    • https://dasateju.weebly.com/uploads/1/3/4/5/134582383/2126643.pdfIn PDF document text
    • https://xolojafiwonizup.weebly.com/uploads/1/3/5/9/135966724/dotapifugowelir.pdfIn PDF document text
    • http://vekisonoloze.sportsontheweb.net/facade_lighting_design.pdfIn PDF document text
    • https://jafakatulo.weebly.com/uploads/1/3/4/3/134353771/61b0f49e865.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/godewumazek/skyrim_tips_and_tricks_for_beginners.pdfIn PDF document text
    • http://kuxoxokazutuv.myartsonline.com/what_order_do_i_watch_marvel_movies_on_disney_plus.pdfIn PDF document text
    • https://s3.amazonaws.com/gurowozenupifi/south_movie_2018_video.pdfIn PDF document text
    • http://wemaxoseni.myartsonline.com/93273021037.pdfIn PDF document text
    • https://s3.amazonaws.com/fuwenoxuzasila/lepuk.pdfIn PDF document text
    • https://s3.amazonaws.com/xufujofaleki/fexilazumu.pdfIn PDF document text
    • https://0e098354-e5d1-4afc-9be7-763a70ae5e44.filesusr.com/ugd/ef253e_7366d4a0ae7e4bfdbc25d889f89f5e1c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sorapobuk/agatha_raisin_season_2_episode_guide.pdfIn PDF document text
    • https://3dbd840c-7861-42b4-b064-af52d1d2f4eb.filesusr.com/ugd/86319b_5eb76b2dd33c45208135f81b71a271e1.pdf?index=trueIn 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_off0000e216.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE216 5476 bytes
SHA-256: 9bdfe3019941cc42367441bb5117cb5aecdcf2337a38537da508b1cb5fd05a0b
font_01_sfnt_off0000f4c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C4 11104 bytes
SHA-256: 8a68c9aabbda97b1a1290a71cef7feed866ac2f038ebaefbb2cf7a6d8b3f93ca

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