Malicious PDF — malware analysis report

Static analysis result for SHA-256 462aa7044719b649…

MALICIOUS

PDF

69.4 KB Created: 2021-03-11 17:17:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 3ec7597b7cb65ca2f6274f4d5ebf7e49 SHA-1: 6900761a21047d6a8436b5e683af443d451e4c28 SHA-256: 462aa7044719b64932536d2cc302227eeebd5ec710d545eaa23765c56229dad9
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to direct users to malicious websites. The primary suspicious URL identified is https://kuzutuzo.ru/award?keyword=ansys+cfx+pre+user+guide+pdf, which is likely part of the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://kuzutuzo.ru/award?keyword=ansys+cfx+pre+user+guide+pdf PDF link annotation
    • https://cdn.sqhk.co/bisuligiga/aIjeNUa/autocad_electrical_iec_symbol.pdfIn PDF document text
    • https://cdn.sqhk.co/xuxiropuwomo/dypicje/jurassic_world_alive_wiki_dinosaurs.pdfIn PDF document text
    • https://cdn.sqhk.co/gukituzaju/gdjbSge/91896480657.pdfIn PDF document text
    • http://gepidudida.iblogger.org/jesusunefezi.pdfIn PDF document text
    • http://gefavofatefazis.iblogger.org/99606882009.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://3485775d-af35-4505-8fb4-f6750f575e04.filesusr.com/ugd/42f18e_3062d5f6ae774b3aa6fdd7dd8cfdbfb3.pdf?index=trueIn PDF document text
    • https://f039f7e9-c7fa-441d-bf3d-2f0e35d6be10.filesusr.com/ugd/80685d_3278374798ef4cb982494840864e97b5.pdf?index=trueIn PDF document text
    • https://68a74d12-89ac-4a94-b826-09ad332a30bf.filesusr.com/ugd/1a0392_c76725c081db4faaaad8a211bac4f253.pdf?index=trueIn PDF document text
    • https://b2d1eea7-aef5-47fc-962c-88b5513ecafc.filesusr.com/ugd/3a57bc_8c4f3b8495534134891fe5a22434950a.pdf?index=trueIn PDF document text
    • https://167c8e7b-8160-49a2-a88e-f26749d647c8.filesusr.com/ugd/1ad47d_8b2fd98dfde545afae27e2affec4d3da.pdf?index=trueIn PDF document text
    • https://9fbeb193-358d-48fe-b9d9-45f8b63f6b3c.filesusr.com/ugd/ab67b9_e70ba06f2bcd481f81262ff353a4c282.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tarizirefevifab/tri-_fold_brochure_layout_templates.pdfIn PDF document text
    • http://repuxatifugupi.epizy.com/autocad_2008_crack_keygen_free.pdfIn PDF document text
    • https://769966b8-4adc-437e-bba8-f198cf6e171b.filesusr.com/ugd/41a0b6_80aa9d880c6a487da050b5333af1330d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vosimalume/guideposts_books_tearoom_mysteries.pdfIn PDF document text
    • http://doxilotosifoku.epizy.com/hearts_of_iron_4_la_resistance_cheat_engine.pdfIn PDF document text
    • https://s3.amazonaws.com/sowewazulejewi/40808046033.pdfIn PDF document text
    • https://28ed73df-463f-41d7-bc87-4635118fd8e0.filesusr.com/ugd/74acc8_26e1ac9109e9456d80d239314f6f5cc8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/feseni/pentair_triton_ii_tr60.pdfIn PDF document text
    • https://s3.amazonaws.com/bulalowisu/storyboard_definition_in_computer_architecture.pdfIn PDF document text
    • https://a121017b-3fb3-450c-9156-48dd71a9bf80.filesusr.com/ugd/07625c_d279cb07ccaa4a3cb2f624ad42862776.pdf?index=trueIn PDF document text
    • http://ruludamena.epizy.com/android_button_onclicklistener_switch_case.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c961.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC961 4932 bytes
SHA-256: 747d6600448fa9a398639942769c33e08d8916f3d5605361255135511b89da59
font_01_sfnt_off0000da37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA37 9308 bytes
SHA-256: 682c7bfa71f04817355ba813df428b0d0858ee5a449341a6f481c3e350be5ee6
font_02_sfnt_off0000fa04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA04 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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