Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0344936de04978f…

MALICIOUS

PDF

75.7 KB Created: 2021-03-03 21:43:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 9143c79ea9f9d1082a534e51e3aa4086 SHA-1: 78861e0e29f9ddafe94a394a81eae847eca66159 SHA-256: d0344936de04978f8ffe6293df6b9ef009c7dcff8eca818ce44e57fc90fa0560
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a significant number pointing to PDF files, suggesting a link farm or a method to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. The document body, though heavily obfuscated, contains keywords related to technical queries, aligning with a lure to disguise malicious links as search results.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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://baarspo.ru/award?keyword=how+to+fix+gas+water+heater+thermocouple PDF link annotation
    • http://xetanorimenu.iblogger.org/gimimabari.pdfIn PDF document text
    • https://cdn.sqhk.co/pebekaja/fWQidhh/lopaxat.pdfIn PDF document text
    • https://litukepulaj.weebly.com/uploads/1/3/4/8/134863372/9890dd.pdfIn PDF document text
    • https://cdn.sqhk.co/bosamame/Y0GigvO/video_maker_photos_music_free_download.pdfIn PDF document text
    • https://tumumasozoborux.weebly.com/uploads/1/3/1/4/131453535/9240679.pdfIn PDF document text
    • https://lilususuki.weebly.com/uploads/1/3/4/3/134317990/364f7a2954c568.pdfIn PDF document text
    • https://redojakora.weebly.com/uploads/1/3/2/6/132682723/86fa1e4448e.pdfIn PDF document text
    • https://redojakora.weebly.com/uploads/1/3/2/6/132682723/rimatanuk-rasefu.pdfIn PDF document text
    • https://cdn.sqhk.co/nomazotesi/a8hbKij/80191807497.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nexovototato.epizy.com/dream_theater_octavarium_piano_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/vovuzize/google_sheets_for_windows_8._1.pdfIn PDF document text
    • https://s3.amazonaws.com/waxapoz/quiz_answer_crossword_puzzle_clue.pdfIn PDF document text
    • https://s3.amazonaws.com/pizivurapab/85976682029.pdfIn PDF document text
    • http://dizakopalelur.epizy.com/58671689217.pdfIn PDF document text
    • http://woxanegerofokox.rf.gd/19580352846.pdfIn PDF document text
    • https://s3.amazonaws.com/jewizopukuni/fbi_fingerprint_card_template.pdfIn PDF document text
    • https://s3.amazonaws.com/xepululejiwof/pesavolixim.pdfIn PDF document text
    • http://fitunugiwa.rf.gd/wepoxixuzuzurafawupupeki.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_off0000e9cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9CD 5552 bytes
SHA-256: 59ac486a66cade7f038daf663666306078b9a48879de714452bc8952cdee5574
font_01_sfnt_off0000fca4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA4 10720 bytes
SHA-256: 0f98d514a73171cee06144563edf3118db6ff58f50dbee45fe70a8c305354922

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