Malicious PDF — malware analysis report

Static analysis result for SHA-256 10e993666ce2a3e2…

MALICIOUS

PDF

74.1 KB Created: 2021-03-28 09:34:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 07d7f10bee0e39ef35878e7db2b1697a SHA-1: e4ee098812f8944032dc562e040165cc9f4945c4 SHA-256: 10e993666ce2a3e2fa2b01ca44dc56d2f0ecac8d3aaf84c0e2cc04dad651e3cc
164 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying a link farm designed to host multiple PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were extracted, the presence of many external URLs suggests a downloader or phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://golowaki.ru/123?utm_term=borland+turbo+c+4.+5+64+bit
    • http://gradstroy.su/molofokugeneledilu6v4.pdf
    • http://organize.shop/fubikigabeiex7m.pdf
    • https://cdn.sqhk.co/nujizeres/vgegjhd/animal_crossing_pocket_camp_wiki_gulliver.pdf
    • http://verification-help.business/get_followers_in_instagram_apkxbbgm.pdf
    • https://cdn.sqhk.co/gebemiwisero/1brspKY/vigaxiwagukiwozegubufu.pdf
    • https://cdn.sqhk.co/feluxolid/kjhjhib/63162605328.pdf
    • http://uspehdnyaaxyz.xyz/14978656646ovkut.pdf
    • http://copyrightshelpcenter.com/536287427484e0yj.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://a16eeaf1-ab09-4fb7-bdbc-3ebfa24c279d.filesusr.com/ugd/03042f_2628afa94f9840e8b5b8ff8fc907c0d6.pdf?index=true
    • https://uploads.strikinglycdn.com/files/409d2ee7-22ed-4d68-8f35-dd5acf611f4b/the_maze_runner_film_cast.pdf
    • https://b6f97e74-198a-461d-a312-d71b9712332b.filesusr.com/ugd/a2d007_728360ce0c0446a4b8fc442c094cd239.pdf?index=true
    • https://a12a05ab-6462-4855-b086-b0a2a961d6d8.filesusr.com/ugd/2c76f4_cc6b74fae12e470e82fc8bbbb167d722.pdf?index=true
    • https://4dcfe184-cd6c-48f8-9f23-5461c743a1d4.filesusr.com/ugd/cc8533_5853ab461736411aa7197fd6756ac724.pdf?index=true
    • https://b7c6a474-53ed-4139-af63-4b2f501ae0e7.filesusr.com/ugd/e87294_9705c62522fe461aa65a803c789d6c57.pdf?index=true
    • https://uploads.strikinglycdn.com/files/478712d8-68df-401b-af34-18cd39428d28/selawel.pdf
    • https://e5058785-d3d1-442e-b0ad-d0045053dde7.filesusr.com/ugd/17c622_64d821014c434e7c864b476e8883010d.pdf?index=true
    • https://a21f0d7d-5fe0-4a99-a381-3b18266e0880.filesusr.com/ugd/6c313a_e36cd63bcf234f5bb7395339e6e8aa24.pdf?index=true
    • https://aa0e52d0-3c12-4d86-bfd3-e3284f950a51.filesusr.com/ugd/eb1974_1c6b044464ec4271a5591d20b7f2d4c0.pdf?index=true
    • https://436010f1-0dd7-4950-aec0-3bdf337573e8.filesusr.com/ugd/5a4c69_f9db3c3ac4f443b5887fe87cadc68eb9.pdf?index=true
    • 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_off0000e0f1.bin
c08b5059ad4e68c6a7213069e030ebe67c43266fdfa9600d55fd76eee1277c1d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE0F1 5344 bytes
font_01_sfnt_off0000f331.bin
a097bd894c7bff0076a657f1871e70fe90f8c1352a5f604bd2065a631dee65e5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF331 11436 bytes

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