Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5b7910b6d0068f2…

MALICIOUS

PDF

81.8 KB Created: 2021-03-21 21:29:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 37402fd0e56d94ea2c5a38e812cd4e04 SHA-1: b2f6af05961fb108be3abe5ac62e5dd41b134666 SHA-256: f5b7910b6d0068f22530be60749dd88cfb551bedce185dc862e53e228a7ea801
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan payload. It contains numerous external URIs, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The heuristic 'SE_LOLBIN_RUN_COMMAND' firing with 'powershell_script.pdf' suggests an attempt to execute commands, likely to download and run a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://nipisod.ru/123?utm_term=reference+letter+template+nz
    • http://zijukikov.mypressonline.com/algorithms_in_java_sedgewick.pdf
    • http://xifadezuzurap.medianewsonline.com/advanced_mathematics_topics.pdf
    • https://tunoworuv.weebly.com/uploads/1/3/4/0/134017870/822654.pdf
    • https://zitavuzan.weebly.com/uploads/1/3/1/3/131379524/kaxevaxuziruz.pdf
    • https://leduzurukidep.weebly.com/uploads/1/3/4/8/134858842/e3186cd2b125008.pdf
    • https://pazuvokase.weebly.com/uploads/1/3/4/6/134615635/meradafa.pdf
    • http://tokexal.medianewsonline.com/subway_surf_hack_download_pc.pdf
    • https://wigazasadus.weebly.com/uploads/1/3/5/9/135974004/xogidas-bivefoduf-dowomuremanuvi-vikurutibuf.pdf
    • http://komamoj.22web.org/texas_form_ap-_114.pdf
    • http://rikafitamedad.medianewsonline.com/75832612204.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/76d1e666-41d3-467f-ba05-71c56d06fe75/jotuba.pdf
    • https://uploads.strikinglycdn.com/files/14dd0db7-d793-47bf-9452-acfc2d683137/cuantos_tipos_de_sistemas_operativos_de_red_existen.pdf
    • http://wukosow.epizy.com/50868122731.pdf
    • https://uploads.strikinglycdn.com/files/f8413e9b-88fa-4fd3-929d-0344c170daf3/best_oster_blender_with_glass_jar.pdf
    • http://sofidubanelen.epizy.com/tulejezolologa.pdf
    • https://uploads.strikinglycdn.com/files/fd2eba22-b4fa-47c9-b1c2-5c6c1c35b575/56028129202.pdf
    • http://fuzaxexudiwa.rf.gd/7079074391.pdf
    • http://fopajika.epizy.com/restaurants_chinon_guide_du_routard.pdf
    • https://s3.amazonaws.com/nisiwanolom/23104342454.pdf
    • https://uploads.strikinglycdn.com/files/3c5e57c1-bad0-46c2-a452-e657b902da47/windows_10_startup_folder_powershell_script.pdf
    • http://netikadikis.epizy.com/el_patriotismo_mijail_bakunin.pdf
    • https://s3.amazonaws.com/bolovopizonuki/dead_man_s_chest_imdb_parents_guide.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://netikadikis.epizy.com/el_patrio
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000104c7.bin
567cb5b6a5587658b997526ebd407bdaa28c0c8859ed8a3022020ea0283d0a39		 pdf-font-stream PDF embedded font (sfnt) at offset 0x104C7 5040 bytes
font_01_sfnt_off000115e7.bin
3048da0d4315f1b07a6df77a6bcdf86b059f00d85084b93f2e1b85973f3db17b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x115E7 10628 bytes

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