Malicious PDF — malware analysis report

Static analysis result for SHA-256 27781a4df2e8923e…

MALICIOUS

PDF

75.2 KB Created: 2021-04-02 08:02:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 0aef1bcf433f35bf50e575c55de89eec SHA-1: a4c6e60ce9e0535ef433e4ca86d733f9a6bab61b SHA-256: 27781a4df2e8923e74c1cca9fcf8b711391d39347ef8f5b541fa63b94d33bf06
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with several pointing to disposable domains and link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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.
  • 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://gimoguvi.ru/123?utm_term=android+10++ota PDF link annotation
    • https://cdn.sqhk.co/zidomirit/hrid4jj/xajikagegazud.pdfIn PDF document text
    • https://cdn.sqhk.co/jifedibodo/2ejfQmg/lakers_world_champions_2020_shirt.pdfIn PDF document text
    • http://myluckybet.xyz/131678232254qs9f.pdfIn PDF document text
    • http://widonatozeg.mypressonline.com/welding_workshop_manual.pdfIn PDF document text
    • https://cdn.sqhk.co/kagitenoru/heQKVRw/janapadalu_folk_songs.pdfIn PDF document text
    • http://tophomework.space/calculus_early_transcendentals_sullivan_miranda9b0c6.pdfIn PDF document text
    • https://cdn.sqhk.co/suxunuke/dhfLy2A/xedasotexefinitosiza.pdfIn PDF document text
    • http://salonvarna.com/87827028427st344.pdfIn PDF document text
    • https://cdn.sqhk.co/mojazejo/MghlogA/zazonotamagarawavalira.pdfIn PDF document text
    • https://cdn.sqhk.co/lisutovudaf/hdgjjhW/best_indoor_go_karts_orlando.pdfIn PDF document text
    • https://cdn.sqhk.co/rubekafux/icIxFjh/word_dictation_not_working_mac.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a4346b84-4611-49ab-b113-80c9188ca613.filesusr.com/ugd/078c79_92567dead477406992e87c824fd6e0ab.pdf?index=trueIn PDF document text
    • http://pulitisagot.atwebpages.com/89541584905.pdfIn PDF document text
    • https://s3.amazonaws.com/tufujifinobiro/gabulepadufatinigo.pdfIn PDF document text
    • http://resilasijajatil.myartsonline.com/321520089.pdfIn PDF document text
    • https://s3.amazonaws.com/domegagowevag/62104136610.pdfIn PDF document text
    • https://s3.amazonaws.com/kukupunopedon/alter_ego_3_guide_pedagogique.pdfIn PDF document text
    • http://dogiwexor.myartsonline.com/windows_10_voice_commands_list.pdfIn PDF document text
    • https://7a512b58-7189-4bc4-8343-f643fa9054c9.filesusr.com/ugd/1e52da_106e15b31fb74f36b7812279832cc187.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tedowafomaru/libro_de_desarrollo_humano_de_diane_papalia_y_ruth_feldman.pdfIn PDF document text
    • https://2ddf8be6-044d-4f30-b6fd-16c032829cd6.filesusr.com/ugd/9827ea_2bafeea5e57f494c90fafc99381cf4f3.pdf?index=trueIn PDF document text
    • https://5a1138df-423b-4a5d-a7c7-36223740754e.filesusr.com/ugd/a72fa8_a1caab0f03814782a27fcde5d20373cd.pdf?index=trueIn PDF document text
    • https://fc060a1e-8c1d-4b7d-bafd-75f79d4c6355.filesusr.com/ugd/c0a468_2871e858a8794222aaee7629706ff0a7.pdf?index=trueIn 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_off0000e5ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5AE 4792 bytes
SHA-256: 1295f210d88ca8962599ff06eb815a8b2619c82635bb89477e3027ceefa997b1
font_01_sfnt_off0000f609.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF609 12420 bytes
SHA-256: 75cd3d2e767445988a9b03b28bd287e267fc0ace5af35db44356c9e508c1611a

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