Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac0819b54293408e…

MALICIOUS

PDF

67.7 KB Created: 2021-02-20 22:35:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 4e2ce749faa7a7dd1948d836e0707a6f SHA-1: 6b5cdb9ccf8a8c95137f55e006fb19e6c6278359 SHA-256: ac0819b54293408e30d1eb7fb578b93a8e1bcf6fb11ffeb785c52a95f34fb0f8
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of external URIs and the link farm heuristic point towards an attempt to direct users to compromised or malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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://jottigo.ru/123?utm_term=wiring+diagram+for+18+hp+briggs+stratton+engine PDF link annotation
    • http://mstmail.space/revikutaecoqp.pdfIn PDF document text
    • http://xudeduda.iblogger.org/alexicom_aac_for_android.pdfIn PDF document text
    • http://esclub.pro/country_music_hall_of_fame_store_hoursaqhew.pdfIn PDF document text
    • http://car-test.pro/mach_4_hobbyqh1do.pdfIn PDF document text
    • http://gbarb.me/pokuwululusezeribotiwoda9bp1k.pdfIn PDF document text
    • https://cdn.sqhk.co/novigigexuxo/c4ihheo/dancing_with_the_stars_2020_winner.pdfIn PDF document text
    • http://lifegirls.site/vuwasesumewuxalp6dhr.pdfIn PDF document text
    • http://future-techno.ru/widulanoluxabikflz72.pdfIn PDF document text
    • http://lnstagramservicecopyrights.com/weekend_at_bernies_cast_salarylvnsf.pdfIn PDF document text
    • http://help-lnstagram-verifycopyrgiht.com/mutopivenomifoxiixmdb.pdfIn PDF document text
    • http://digitalmedialit.com/dream_daddy_joseph_all_endings0lw2g.pdfIn PDF document text
    • http://astrology-personal.online/children_s_beds_for_sale_gumtreelse5h.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/rimejiguvif/31929570781.pdfIn PDF document text
    • http://susixegan.rf.gd/template_of_a_formal_letter_of_complaint.pdfIn PDF document text
    • http://zetulinug.rf.gd/10384926322.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_off0000cb03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB03 5824 bytes
SHA-256: 851791fff4182c756c9acf5257658bae5b2acfc05e8bc1d470e60f64715b3b36
font_01_sfnt_off0000deb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEB9 10248 bytes
SHA-256: 6bda20a65ddc632a119ee293863889d415f10fec70e5d578346cd2e72d2c89ca

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