Malicious PDF — malware analysis report

Static analysis result for SHA-256 d648f5ece4f05109…

MALICIOUS

PDF

74.8 KB Created: 2021-04-01 21:58:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 16e4942dbacb71ea2b1ad74a4490ec84 SHA-1: 54887c81ee4cef5f9f0c763030e978183464d688 SHA-256: d648f5ece4f05109c908f82626f24f31e89020be40b8adc054d9a8a68c5af0bd
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged by multiple heuristics and an ML classifier as malicious, specifically identified as a phishing trojan by ClamAV. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains text related to 'engagement invitation card photoshop template' and metadata indicating it was generated by wkhtmltopdf, which can be used to create malicious PDFs. The presence of multiple external URIs indicates an attempt to redirect the user to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://vilenefex.ru/123?utm_term=engagement+invitation+card+photoshop+template PDF link annotation
    • http://lnstagramverifiedsbadgeform.com/pavotonefokaxikowjv89.pdfIn PDF document text
    • http://creampiepow.club/7647071146w6f03.pdfIn PDF document text
    • https://feboxozuje.weebly.com/uploads/1/3/5/9/135973722/larofe.pdfIn PDF document text
    • http://heleogose.online/java_json_number_formatws4qv.pdfIn PDF document text
    • https://badosesidexezub.weebly.com/uploads/1/3/0/8/130874160/xudajafet.pdfIn PDF document text
    • https://kaxitojuwomig.weebly.com/uploads/1/3/5/3/135302818/556ea.pdfIn PDF document text
    • https://nesibebinirudeb.weebly.com/uploads/1/3/5/3/135311353/8901323.pdfIn PDF document text
    • http://sirovikokaxi.22web.org/dslr_controller_apk_for_nikon.pdfIn PDF document text
    • https://mafaredoli.weebly.com/uploads/1/3/2/6/132695491/7757785.pdfIn PDF document text
    • http://kukushpa.fun/65971129407lew9r.pdfIn PDF document text
    • https://kitopelok.weebly.com/uploads/1/3/4/3/134355781/ziver.pdfIn PDF document text
    • https://dazobexureza.weebly.com/uploads/1/3/1/3/131383777/6470513.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nazifaba.rf.gd/move_music_files_to_sd_card_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7acaddeb-c48c-4ce7-b8b0-24858598f4e1/72469579049.pdfIn PDF document text
    • https://s3.amazonaws.com/jinotugiwomo/java_8_stream_filter_list_within_list.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa606c5a-000d-49b2-b14f-57c4824b8ccb/wefarafajijawaparenerid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7883a19-79e7-493b-9b51-efd2a67223ad/grasslin_timer_fm_1_stuz-l.pdfIn PDF document text
    • https://s3.amazonaws.com/kobivimelelo/xifupulotivifozupukuk.pdfIn PDF document text
    • http://jatomije.rf.gd/gotranscript_quiz_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d9cefc7-a2e6-490d-9d46-063ae42d5ce1/60249746884.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_off0000e5f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F2 5504 bytes
SHA-256: 85bfa1353dce1ca10be2ebfddf8f634b5d71ba9593d9e3c7f2c6ee1ccc3a6869
font_01_sfnt_off0000f88d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF88D 10716 bytes
SHA-256: 7785b6ae01b70d096c26c747e5b251d83dd1468953c4f1011f60aa891aff8ec8

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