Malicious PDF — malware analysis report

Static analysis result for SHA-256 584dadadb594d041…

MALICIOUS

PDF

73.8 KB Created: 2021-03-27 15:48:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 2787a59274a60acc6b9d7e7c2d8e9901 SHA-1: 4b77dd79c44dff42422a10e02fec37425802ed98 SHA-256: 584dadadb594d041872eb707032dddcdf99d6a7d75a5325e1e8a4bd0171c9f79
134 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable hosting, and a heuristic indicates it functions as a link farm with UTM parameters, suggesting a phishing or malware distribution lure. The presence of a 'download button' heuristic further supports this, indicating an attempt to trick the user into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://lozipotod.ru/123?utm_term=agrobacterium+ti+plasmid+pdf PDF link annotation
    • https://cdn.sqhk.co/bexefoboxevi/YKhc6jg/fipisubegolixalod.pdfIn PDF document text
    • https://cdn.sqhk.co/dubikewe/jifW0ib/28344234348.pdfIn PDF document text
    • http://crysety.xyz/damevibaxuvisojiwebotaro3fmjk.pdfIn PDF document text
    • http://nakalabaxis.mywebcommunity.org/62654928579.pdfIn PDF document text
    • http://harkateine.fun/onam_wishes_2019_video_freevi0fh.pdfIn PDF document text
    • http://dekovag.mypressonline.com/41420004999.pdfIn PDF document text
    • http://ibkreactiva2020.com/ignou_b.ed_entrance_exam_syllabusamw8b.pdfIn PDF document text
    • https://cdn.sqhk.co/rogolafu/hiejahe/skyrock_radio_libre_2019.pdfIn PDF document text
    • http://nutristrike-shop.ru/13165819089bip1l.pdfIn PDF document text
    • http://piwofoterif.sportsontheweb.net/7986022536.pdfIn PDF document text
    • https://cdn.sqhk.co/zowonefaso/heidggh/how_to_delete_twitter_login_notification.pdfIn PDF document text
    • https://cdn.sqhk.co/lasesekov/gd67a4t/72608604664.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://maretubozewugi.myartsonline.com/32186368130.pdfIn PDF document text
    • https://s3.amazonaws.com/natewared/django_jinja_template_tags.pdfIn PDF document text
    • https://s3.amazonaws.com/naxizugenabi/xukameravumowokir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8422958-0831-437e-a688-234a9e39a775/american_red_cross_blood_donation_nyc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6973a362-7a75-4740-9813-755c28526f42/royal_guards_chamber_location.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_off0000df8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF8B 5604 bytes
SHA-256: edc059e9efaccd50e623110c9ffc38c4b5fd2b4a190b181a76be1b926f54703c
font_01_sfnt_off0000f281.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF281 11264 bytes
SHA-256: abb4d581095929a6b6fd043e98d5502b3085a200848f03bae063a2b0fb2642af

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