Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f15ca10ea8d3166…

MALICIOUS

PDF

75.1 KB Created: 2021-03-07 18:37:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: d21291656c077dd45c7cab4d9b2d3291 SHA-1: e708f345fe6833b902140062799a8d6090b66b14 SHA-256: 4f15ca10ea8d3166cd98ca344951d69d685b0f287582838931afc8f0c47d1a28
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 point to potentially malicious domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though heavily obfuscated, appears to be a lure related to a service manual, likely to trick users into clicking the embedded malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://xajibur.ru/strik?utm_term=2008+harley+sportster+service+manual PDF link annotation
    • http://porn77.design/animated_movies_dual_audio_300mb2tafl.pdfIn PDF document text
    • http://pycnidwzxc.info/how_much_money_do_physiologists_make_in_the_ukzlb39.pdfIn PDF document text
    • http://doorstepcomputers.com/blood_stains_out_of_bed_sheetsie9cj.pdfIn PDF document text
    • http://vsedlyatebya.xyz/how_to_watch_sword_art_online_in_chronological_orderi7mm9.pdfIn PDF document text
    • http://runmasten.online/pewum1v7c1.pdfIn PDF document text
    • http://italywow.pro/611193738686ctsm.pdfIn PDF document text
    • http://re-capital.ru/how_do_i_fix_my_craftsman_1_2_hp_garage_door_openerve8uz.pdfIn PDF document text
    • http://subonus.ru/sig_p229r_40_review4yxo3.pdfIn PDF document text
    • http://sexedate69.site/25316877024d856m.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://s3.amazonaws.com/tinivukedeta/78322774885.pdfIn PDF document text
    • https://s3.amazonaws.com/zifozujiwi/bushnell_neo_ion_not_charging.pdfIn PDF document text
    • https://s3.amazonaws.com/gavobawum/business_card_sample.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40f02b1e-0574-466c-8d60-66b7caaafee0/we_were_liars_chapter_39_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f942563-663e-4a8a-a2e9-e8e8eb0fc113/william_shakespeare_sonnet_116_summary_and_analysis.pdfIn PDF document text
    • https://26c1613e-5d28-4fa3-89cb-3d2c9ab59faf.filesusr.com/ugd/fe83c3_73b0df733ad147c39a06248ff91bd083.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bejokazemur/47715783347.pdfIn PDF document text
    • https://03dfb0eb-7fe6-4188-ad87-ea2b88df7b19.filesusr.com/ugd/f967ac_0464f4c0d5874e3da8a727f3fe0e1645.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a6d2dfd-fc0d-4d3e-bb78-d9dd6a87ab5a/nodiganov.pdfIn PDF document text
    • https://s3.amazonaws.com/rewepalazamiso/psychiatric_evaluation_template.pdfIn PDF document text
    • https://s3.amazonaws.com/muwemivumazulax/koreguxutakilezofamuwir.pdfIn PDF document text
    • https://s3.amazonaws.com/rodiligarexo/zaromi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9e6ba34-76c3-40a1-9e64-e2f9872eec8c/tebifotijagolagazetataj.pdfIn PDF document text
    • https://938a05da-450f-421e-a59b-0448473a402a.filesusr.com/ugd/cb5dea_9cdf7b1103aa4e36be492738feff14b1.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d2e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2E4 5588 bytes
SHA-256: cf3a5d1b13865a36101a68207c2c11357ed5e15259bf48fc342d9692cf948583
font_01_sfnt_off0000e5ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5BA 13644 bytes
SHA-256: fb01bbf652b92edaab37b59f898d0a0b7668e761772caf7ce117a5ee136eb800
font_02_sfnt_off000110d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110D6 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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