Malicious PDF — malware analysis report

Static analysis result for SHA-256 a487e4e03b24ab34…

MALICIOUS

PDF

74.9 KB Created: 2021-01-13 09:57:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: f3c5479c6d279e7e2d47debc79195ec9 SHA-1: 62f059ed2a8e12e79a0991fc2e82e4aa42a297b5 SHA-256: a487e4e03b24ab3488316c0199a2bf4d0e7fab557c5f4541efa9902514a3c06b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external links, characteristic of a link farm or phishing lure, aiming to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to exploit vulnerabilities or deliver further payloads. The presence of a 'download button' heuristic reinforces the social engineering aspect of the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://traffine.ru/123?utm_term=madhyamik+suggestion+2020+physical+science+pdf+free+download PDF link annotation
    • https://cdn.sqhk.co/girewobo/TvW61if/are_candy_fruit_slices_gluten_free.pdfIn PDF document text
    • https://ridogorizaloliv.weebly.com/uploads/1/3/4/5/134527302/fotapaxidemos_gipujozuv_pomukifasugaz_wiburinimev.pdfIn PDF document text
    • https://xisaluzesa.weebly.com/uploads/1/3/4/6/134602292/bixufuzejux-wogisijizozul-xupegewufuni-nafafetatul.pdfIn PDF document text
    • https://jixejuterekafiw.weebly.com/uploads/1/3/4/5/134508928/d0936c.pdfIn PDF document text
    • https://xovadodelemowuz.weebly.com/uploads/1/3/1/3/131383330/bifogigowika.pdfIn PDF document text
    • https://site-1176001.mozfiles.com/files/1176001/kamine.pdfIn PDF document text
    • https://nagigezivozitos.weebly.com/uploads/1/3/4/3/134340852/fb1ce586a278.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/vebisop/eye_of_the_tiger_piano_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/gomakobez/action_research_in_classroom_discipline.pdfIn PDF document text
    • https://s3.amazonaws.com/pewibim/bomb_blast_game_free.pdfIn PDF document text
    • https://s3.amazonaws.com/fojaxexino/cadillacs_and_dinosaurs_full_game_apk.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
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d6e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6E7 6108 bytes
SHA-256: 7b66bf9a94931c2b2fbd31fce57094607c777f262d0381f1814ebf85c08deada
font_01_sfnt_off0000ebb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB1 3964 bytes
SHA-256: 79d16457c144f286910558d7534077a1907782caf96306f32b8e0f3271daae82
font_02_sfnt_off0000f825.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF825 11240 bytes
SHA-256: 7ae7c364ca4ce3c9237c5cab28808467ad74094ca58852238327be1c8d8f5bd3

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