Malicious PDF — malware analysis report

Static analysis result for SHA-256 892229b9903d9b9d…

MALICIOUS

PDF

77.5 KB Created: 2021-03-16 16:02:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f0474cb43a7fc8c742e26bcac741a7cf SHA-1: 70cb46c48d1593514ea79839fc919cb36d83f257 SHA-256: 892229b9903d9b9d1dd5312c86bdd605bcc7ccd5ae9241795ef7a8a6c10f5f10
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of multiple external links, including one disguised as a download for a specific PDF, and a heuristic firing for a 'Visual download / call-to-action button lure' strongly suggests a phishing or social engineering attack. The document body, though heavily obfuscated, contains metadata related to PDF generation, reinforcing the document-based attack vector.

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://vilenefex.ru/award?keyword=higher+engineering+mathematics+by+bv+ramana+pdf+download
    • http://towonededuv.medianewsonline.com/bulova_marine_star_98b301_review.pdf
    • http://boevoenlp.com/funny_gif_and_memesfr6zl.pdf
    • http://gatorama.site/google_slides_templates_gratisbsf1c.pdf
    • http://proita.fun/does_double_strike_include_first_strikesa7ee.pdf
    • http://gimemuwet.mypressonline.com/death_in_family_out_of_office_message.pdf
    • http://levantemosaic.com/munchkin_weighted_strawsb4kl8.pdf
    • http://astrology-personal.online/incarceration_nations_baz_dreisingeryf4jv.pdf
    • http://hot-money.fun/slingshock_rail_rush_stadium_new_hasbro_burst_turboz0xaj.pdf
    • http://digosige.mywebcommunity.org/important_characteristics_of_report_writing.pdf
    • http://bestcreditcheck.info/webekadukabowazevak3tpeb.pdf
    • http://idealsit.space/titration_of_aspirin_lab_report_conclusionahtdo.pdf
    • http://indital.space/memimiplxrma.pdf
    • http://haifaiv.ru/the_mystery_of_the_shemitah_free_download7cma0.pdf
    • http://netewe9.xyz/allegiant_free_stream_online0tqwb.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/1dbc0cb9-ed66-4d69-a25d-69b0a082e551/baxuwilugo.pdf
    • http://zutaturusix.myartsonline.com/standard_enthalpy_change_of_reaction_a_level.pdf
    • https://uploads.strikinglycdn.com/files/1d775fe0-c441-4910-8d86-4aba0206d8f0/50138086171.pdf
    • https://uploads.strikinglycdn.com/files/a42a353d-3f4f-4484-829e-abace6e81876/36328177595.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eba1.bin
a4320283474966038eaa54e724b043a9e85d22ed81f2a5fea8028cb8b598b3a5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA1 5924 bytes
font_01_sfnt_off0000ffb7.bin
1165f7561df4d8f4f2b5d555b2379eec4a8ebaa70204364a6108416086565e4c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB7 11360 bytes

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