Malicious PDF — malware analysis report

Static analysis result for SHA-256 79e05d1524588aea…

MALICIOUS

PDF

71.1 KB Created: 2021-03-18 23:57:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: f2ad625a7983a21f9332b363b4f2f16b SHA-1: f28b283fcb7835e4be4f4cb7065c081e0d670ccd SHA-256: 79e05d1524588aea28cca9740978ceb148cfbb6e9928ac96c009c60de1b5a05b
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm, with a high ML score and ClamAV detection indicating malicious intent. The embedded URLs, such as 'https://nipisod.ru/strik?utm_term=casio+pcr-t280+paper+roll', suggest a phishing or SEO manipulation scheme. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to redirect users to potentially harmful content, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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 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://nipisod.ru/strik?utm_term=casio+pcr-t280+paper+roll PDF link annotation
    • https://cdn.sqhk.co/liramesot/lrtm6vn/flip_animation_in_android_xml.pdfIn PDF document text
    • https://cdn.sqhk.co/dezorevukor/bwijgjg/retro_arcade_console_1388_game_list.pdfIn PDF document text
    • https://cdn.sqhk.co/noxuluni/X5pggbY/mobi_world_of_sport.pdfIn PDF document text
    • https://cdn.sqhk.co/neratimo/gj62geZ/95649104674.pdfIn PDF document text
    • https://cdn.sqhk.co/xiladuxe/haQginP/throne_room_lyrics_pentecostals_of_alexandria.pdfIn PDF document text
    • http://zomolejefej.mywebcommunity.org/midisewexetit.pdfIn PDF document text
    • http://rexonina.medianewsonline.com/how_to_adjust_speed_on_club_car_precedent.pdfIn PDF document text
    • http://kiwenalod.medianewsonline.com/52050361984.pdfIn PDF document text
    • https://cdn.sqhk.co/guzowozuk/ergjKhg/jungle_animal_hair_salon_games_online.pdfIn PDF document text
    • https://cdn.sqhk.co/banamasuvaj/hZifhfK/xofakusofopubunulizupit.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6d428a25-da86-44fa-8f13-5b0f09742281.filesusr.com/ugd/3649d2_7edcb6023f36457fa452e645d5ad375b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/befafuni/anticoagulation_guidelines_interventional_radiology.pdfIn PDF document text
    • https://s3.amazonaws.com/xumakomowi/68527475055.pdfIn PDF document text
    • https://s3.amazonaws.com/muxozuvalubi/18429412192.pdfIn PDF document text
    • http://femagela.myartsonline.com/exemple_attestation_d_hbergement_pour_visa_tudiant.pdfIn PDF document text
    • https://s3.amazonaws.com/naxozelozude/performance_appraisal_comments_for_initiative.pdfIn PDF document text
    • https://s3.amazonaws.com/bupaxomu/tudoropevodeguwubajosokep.pdfIn PDF document text
    • https://s3.amazonaws.com/wajufifenoxuj/24753231539.pdfIn PDF document text
    • https://cd70d4e5-4a1a-4071-96d1-f2415ea5ece1.filesusr.com/ugd/7f46b5_748eed8958ec4dadbb5f2cf52e635d98.pdf?index=trueIn PDF document text
    • https://f06ae689-34e6-4fd9-b749-a5985747e370.filesusr.com/ugd/4117a9_589d7108cbdd49b5823c908be51e045c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/davolazupivowi/gixiniviropisolipewo.pdfIn PDF document text
    • https://s3.amazonaws.com/paxivogedewilu/38586342547.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d6ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6CE 5332 bytes
SHA-256: 630ad5d09c4ec19de97cb932592ddc15c7709c3353f980293c3156cd2aa66a96
font_01_sfnt_off0000e8f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F7 11160 bytes
SHA-256: 3bd239412b7412426d86cbc5876e09b6285bc1f005ad0edd117b95f1b1f6036c