Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cb6db4f1b2cdad6…

MALICIOUS

PDF

78.4 KB Created: 2021-03-27 11:52:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 8dc4b916d35ec98a866dddc8c0da7812 SHA-1: e127454572b0077eb639a414b644d18ebbec091f SHA-256: 1cb6db4f1b2cdad656397e754a87e1e3ab973b883a50c3624447f1e252de8f5e
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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 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.
  • 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://resalured.ru/123?utm_term=free++uncle+ato+worship+songs PDF link annotation
    • https://cdn.sqhk.co/batumozi/AghVfhg/jowawudi.pdfIn PDF document text
    • https://cdn.sqhk.co/sudagewas/iSPyNjg/ruvupiluzotaw.pdfIn PDF document text
    • https://cdn.sqhk.co/vadezewe/ihdhrhh/gekote.pdfIn PDF document text
    • https://cdn.sqhk.co/wiradimabid/FnhdhcU/lapanofomebit.pdfIn PDF document text
    • https://cdn.sqhk.co/luwiliziv/jYjjXgh/payment_of_gratuity_bare_act_1972.pdfIn PDF document text
    • https://cdn.sqhk.co/jigugabopu/janiaig/65540730712.pdfIn PDF document text
    • https://cdn.sqhk.co/fosojatesog/eiahhOK/33806919251.pdfIn PDF document text
    • https://cdn.sqhk.co/dedizajo/igJggJB/95746144405.pdfIn PDF document text
    • https://cdn.sqhk.co/pirasemofoge/fJiigfs/mysejahtera_hotspot_tracker_not_working.pdfIn PDF document text
    • https://cdn.sqhk.co/goremujoz/JNjhiho/zosalub.pdfIn PDF document text
    • https://cdn.sqhk.co/sovajepuxe/BW76Yih/four_in_a_line_java.pdfIn PDF document text
    • https://cdn.sqhk.co/wovenebi/pxiBLhh/need_for_speed_rivals_ps4_controls.pdfIn PDF document text
    • https://cdn.sqhk.co/jikogifuxa/ahhiejb/usa_3d_truck_simulator_2016.pdfIn PDF document text
    • https://cdn.sqhk.co/jesupasuzoku/jiYjeP6/wifi_analyzer_android_github.pdfIn PDF document text
    • https://cdn.sqhk.co/lofesaxudiwo/aigicje/stomach_cramps_ibs_symptoms.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8eeb1f0a-0cdd-4c66-98a4-83777b49fb54.filesusr.com/ugd/64f9d2_35a04d13d6ae4c18af0eb11f775e6237.pdf?index=trueIn PDF document text
    • https://146c8b6c-0b46-450b-8ed0-b45f1e2a4974.filesusr.com/ugd/b58d21_32e60d720087481eb4bcf76c47a7dd72.pdf?index=trueIn PDF document text
    • https://e1eccfe9-8888-4f52-a155-e9c8e84e0752.filesusr.com/ugd/4fb05f_0e14b0dc91834c85b8886cf40560afd6.pdf?index=trueIn PDF document text
    • https://db244590-af71-4c33-bd6e-2f8f55f31281.filesusr.com/ugd/fdab61_0d648c527c9d4895acdeb95bd45eb565.pdf?index=trueIn PDF document text
    • https://7c50ec62-1ece-451b-b03c-4788199016cf.filesusr.com/ugd/635f3c_abccc4506e8e4fafadf8e06b39a22874.pdf?index=trueIn PDF document text
    • https://1237a3da-0b33-4890-9ba9-974507bf2590.filesusr.com/ugd/3e0cb9_8bf47b763d2a4b8782b90d571c8930f6.pdf?index=trueIn PDF document text
    • https://28546a20-d0cc-4b82-bb4f-6711990cd5a3.filesusr.com/ugd/0bcf16_1f18f3f557cc432488ce5a34642c10c4.pdf?index=trueIn PDF document text
    • https://cd489911-dc6d-4439-b408-84622343fb93.filesusr.com/ugd/d8e941_e4029af8daf44e108df207715e1d4968.pdf?index=trueIn PDF document text
    • https://023e3b0e-89aa-4e00-bd19-175c11a0a9c0.filesusr.com/ugd/5f4883_45832c0274eb430283848f7d21f5bf0c.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_off0000f3df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3DF 5240 bytes
SHA-256: 8647de3471c228b3bccf02ff2957d2e6dd9548dc2d7a9780fe5eacd0adf310dd
font_01_sfnt_off000105c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105C9 11676 bytes
SHA-256: dd43c7e08541537ca3c63c28cea5d8f87995e121f973ca7d4511dc5fef026b65