Malicious PDF — malware analysis report

Static analysis result for SHA-256 45a45c9eab87cfed…

MALICIOUS

PDF

75.1 KB Created: 2021-02-21 07:26:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: e9971ffbd01fd139c1a682148a83777c SHA-1: 9d22009617757c4517d9153548b8e3d07a12191a SHA-256: 45a45c9eab87cfed0303eaf01d4a0932e0db8278740d0694e7c1f6fbe4b0381a
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://maypoin.ru/strik?utm_term=algebra+1+online+textbook+mcgraw+hill+pdf PDF link annotation
    • https://cdn.sqhk.co/bapuwanuvadi/shhxRzc/beat_the_buzzer_multiplication_game.pdfIn PDF document text
    • https://volufijipezuji.weebly.com/uploads/1/3/4/7/134703795/nawegogakit-xukexunubagosul-nojive-famusepuz.pdfIn PDF document text
    • https://cdn.sqhk.co/dudexobexine/gjbgggh/74498336487.pdfIn PDF document text
    • https://cdn.sqhk.co/zajujinul/eYZYmmB/medieval_battle_simulator.pdfIn PDF document text
    • http://milanbeach.fun/92600599512r4ef6.pdfIn PDF document text
    • http://help-lnstagramcopyrights-verify.com/pcp_pneumonia_treatment_guidelines_idsavia8o.pdfIn PDF document text
    • https://cdn.sqhk.co/tuzevawu/eXAUFSg/44623284246.pdfIn PDF document text
    • http://gonzo-3d.com/vector_full_mod_money9awql.pdfIn PDF document text
    • https://cdn.sqhk.co/kunutewiwit/i6jaNyV/sns_nails_near_me_open_sunday.pdfIn PDF document text
    • https://cdn.sqhk.co/budajawisore/tjcjgih/29742653372.pdfIn PDF document text
    • https://cdn.sqhk.co/gagobuniponi/bhiqjgh/games_like_idle_roller_coaster.pdfIn PDF document text
    • https://mefupajudeto.weebly.com/uploads/1/3/4/8/134883840/mesorewipovev.pdfIn PDF document text
    • https://siwuxamafovad.weebly.com/uploads/1/3/4/4/134489720/kelelizotifajuwobe.pdfIn PDF document text
    • https://sixalusizefew.weebly.com/uploads/1/3/1/3/131378898/vepasixoken-zefukunu-kewudilufira.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/zupenafud/rediwa.pdfIn PDF document text
    • https://s3.amazonaws.com/golepe/puxeru.pdfIn PDF document text
    • https://s3.amazonaws.com/bulolimepol/blender_2._79_user_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/fuwawibu/5358731858.pdfIn PDF document text
    • https://s3.amazonaws.com/bodajaku/angry_birds_transformers_unlimited_gems_and_coins.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_off0000e3a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A2 5796 bytes
SHA-256: 416d3ae8e67b2741eb4bdee1b0227ae06aa39a0de57f88f3e208dfe64adf4cd0
font_01_sfnt_off0000f758.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF758 12088 bytes
SHA-256: 5d599b69ae4b42870838ace323bc1dc752bdf491f27b34c7e74372acc15cf754

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