Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc51222e004e91a8…

MALICIOUS

PDF

87.9 KB Created: 2021-03-09 18:45:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 587282912f8ad511816c7ae982fb0cdc SHA-1: 5ea9268fc331f6a634ddb2cd78ea7dab90105dbb SHA-256: dc51222e004e91a882ef31f23e1727c9bf0e1088bc79713dd9c59f2eec7ca636
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, embedding a large number of URLs pointing to disposable hosting, likely to distribute further malicious content or conduct phishing. The document body is heavily obfuscated and unreadable, providing no direct clues to its intent beyond the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://leonvi.ru/strik?utm_term=how+to+block+youtube+on+lg+tv PDF link annotation
    • http://lipexifinidoda.scienceontheweb.net/starcraft_2_cheats_legacy_of_the_void.pdfIn PDF document text
    • https://cdn.sqhk.co/fifenije/hcTjbz9/tamil_voice_typing_keyboard_for_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/sevafeluba/geAxcgg/79958933293.pdfIn PDF document text
    • http://kerutugizuxig.mygamesonline.org/83065719366.pdfIn PDF document text
    • http://memisada.mygamesonline.org/wujugikidaxafujinem.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/2970bc3f-387d-4c74-801e-d940887528ca/37666042704.pdfIn PDF document text
    • https://s3.amazonaws.com/gomaxod/instagram_story_covers_template.pdfIn PDF document text
    • https://4900ecec-7ac1-411c-be2c-b077674085c8.filesusr.com/ugd/493135_5620ca47346d4970a5375194b5759ab1.pdf?index=trueIn PDF document text
    • http://xujalupa.epizy.com/peraranevupewogo.pdfIn PDF document text
    • http://nukivamo.myartsonline.com/how_to_troubleshoot_mini_split_ac.pdfIn PDF document text
    • http://mirepili.epizy.com/kali_linux_android_without_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/926567ee-a2c5-4203-a254-3a3cdf19d5c2/80808600526.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/653427ad-3c8f-4ced-9e02-dcec1fe565f3/advanced_marathoning_training_plan.pdfIn PDF document text
    • https://9849c7ec-8b19-4b81-9a64-db2537ea7c40.filesusr.com/ugd/97b1c0_7d7442b6232547b183042ef25da9fd02.pdf?index=trueIn PDF document text
    • http://jabejanaboz.atwebpages.com/when_i_met_you_quotes.pdfIn PDF document text
    • https://61249681-e2d1-4375-841a-b3723294d79c.filesusr.com/ugd/3d514e_44c31d038fa4477d9b16f2284b0befb2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pisedij/sukufomiziloruwizigexute.pdfIn PDF document text
    • http://napubuxuwel.epizy.com/bauhaus_93_normal_font.pdfIn PDF document text
    • http://nunevubedodunu.rf.gd/best_travel_guides_for_peru.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af8770d0-c7b3-4ae6-8133-e91309bc4bc9/veremubezuvon.pdfIn PDF document text
    • https://c81c1a69-aec6-471c-ac34-7a6800eafc69.filesusr.com/ugd/9ef1ea_8b1d2a9f7ef043eba3c16683d6cfb297.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bifamomove/nulekapifowigenatosir.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000106bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106BC 4904 bytes
SHA-256: 877734b1096c6c0dd041235726d4c3f08d6daa3582801bbecd42e9d29767f76a
font_01_sfnt_off000117a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117A5 10992 bytes
SHA-256: 107272b7c03d3c18e6cd4e559b83456334557a69debdebb7c8d9dca492e8856b
font_02_sfnt_off00013d27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D27 16084 bytes
SHA-256: bf5ec4383cdf52cad07d346b2843a66e6085f1f3054c326d01423588993556d9