Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a1ce715ac1e979f…

MALICIOUS

PDF

89.2 KB Created: 2021-02-01 09:16:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 0786b77e66512fe61d6911bed975be05 SHA-1: d013a073a95e585b5fb5e6f3f34f071a27de6983 SHA-256: 3a1ce715ac1e979feeaa7a908fa2219c6ced845d5c4732e0ae2d02c5c4cef4f2
226 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of 'cmd.pdf' and 'http://' in the document text, along with the overall structure, points towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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 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.
  • 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://seumenha.ru/aws?utm_term=physiotherapy+assessment+form+for+cerebral+palsy PDF link annotation
    • https://dunawotota.weebly.com/uploads/1/3/1/4/131438316/godepoj_pakelemuvipu_figer_widoxivorul.pdfIn PDF document text
    • https://cdn.sqhk.co/mezutorixo/ridzMaC/48454500901.pdfIn PDF document text
    • https://bexipame.weebly.com/uploads/1/3/0/7/130776855/f090636f8e.pdfIn PDF document text
    • https://zekorawuj.weebly.com/uploads/1/3/4/8/134862422/8218348.pdfIn PDF document text
    • https://zeraxoxuret.weebly.com/uploads/1/3/4/6/134642117/liluripigezis.pdfIn PDF document text
    • http://replyua.site/injustice_gods_among_us_mobile_hack_ios9j7np.pdfIn PDF document text
    • https://cdn.sqhk.co/gurukemopuge/gehfjiy/power_rangers_all_stars_mod.pdfIn PDF document text
    • http://realwockyc.info/go_karts_pigeon_forge_tn_prices1cfdm.pdfIn PDF document text
    • https://bogagabav.weebly.com/uploads/1/3/5/3/135305267/fujajosadonibo_rajeweturave_munovezemel_mesorim.pdfIn PDF document text
    • https://lapadodipelij.weebly.com/uploads/1/3/1/1/131164402/589cfcc3176080.pdfIn PDF document text
    • http://pink-echo.club/148728466873qcmd.pdfIn PDF document text
    • http://leftoutclub.com/ejercicios_resueltos_de_distribucion9l51z.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/wukevirenesu/ark_survival_evolved_android_apk_file.pdfIn PDF document text
    • https://s3.amazonaws.com/regufojalojaza/java_spring_resttemplate_postforentity.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_off00011cd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CD8 5496 bytes
SHA-256: 9b71e6b394fdebf791c8edf52a63d18af5c4f9dd00bfb9a5aab1a3803c50aa4b
font_01_sfnt_off00012f6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F6A 11668 bytes
SHA-256: a947382a89ae3872e386c3fe4c63714cae4e877fa635e29c2c719bcfd19da69b

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