Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ffc204411857e25…

MALICIOUS

PDF

82.7 KB Created: 2021-03-15 19:53:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: c0803d008e9f17a5588515e51a3956ee SHA-1: a5e995ddea991e3247f8bc1286d4a613e1bbca6e SHA-256: 3ffc204411857e253f06c6233ab4937ef78b059195030b1c8fb133c4ed096027
224 Risk Score

Malware Insights

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

The PDF contains multiple embedded links pointing to suspicious domains, with one explicitly identified as a malicious redirector. The heuristic 'SE_LOLBIN_RUN_COMMAND' suggests the document may attempt to execute commands, potentially to download and run further payloads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/strik?utm_term=how+to+treat+cystic+acne+on+scalp In PDF document text
    • https://cdn.sqhk.co/pugudanirav/iK0Dij7/weather_forecast_for_chicago_area_today.pdfIn PDF document text
    • https://cdn.sqhk.co/kigoxeni/1FhajcQ/loxiruzoxafepof.pdfIn PDF document text
    • https://cdn.sqhk.co/tolononof/e9geRBn/sekoza.pdfIn macro / runtime command snippet
    • http://serudajalasipa.iblogger.org/international_business_articles_2019.pdfIn macro / runtime command snippet
    • http://melifalafijuz.22web.org/60311678826.pdfIn PDF document text
    • http://soldonlakewood.com/free_aoi_bungaku_sub_indototl2.pdfIn PDF document text
    • https://cdn.sqhk.co/lekabadixi/ejcWgf6/cute_animal_colouring_pictures_to_print.pdfIn PDF document text
    • https://cdn.sqhk.co/fefowofuk/ezliiH0/98478746928.pdfIn PDF document text
    • http://white-x.fun/66073652618r23rk.pdfIn PDF document text
    • http://bosnoslovnoejelaniekupit.xyz/wudomamomisojozexoxku7cn.pdfIn PDF document text
    • https://cdn.sqhk.co/janawezexoj/cjajhwS/word_generator_words_with_friends_cheat.pdfIn PDF document text
    • https://cdn.sqhk.co/bizujutenifo/jgjighd/home_electrical_wiring_design.pdfIn PDF document text
    • http://thehensleys.org/xufofatedaxogemurnsg.pdfIn PDF document text
    • https://cdn.sqhk.co/wofutajo/ilbmuEG/ben_10_omniverse_heatblast_transformation.pdfIn PDF document text
    • https://cdn.sqhk.co/kigoxeni/1FhajcQ/loxiruzoxIn macro / runtime command snippet
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/dowadotiju/duwanerijefebojunadido.pdfIn PDF document text
    • https://s3.amazonaws.com/fojaxexino/correct_barbell_curl_form.pdfIn PDF document text
    • http://gigigij.rf.gd/lovadibulidemoxigojuzete.pdfIn PDF document text
    • http://lufafutogixafu.rf.gd/davis_drug_guide_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/xujitezu/ielts_informal_letter_sample.pdfIn PDF document text
    • http://refipazak.epizy.com/sosedekeberuvopegigorovod.pdfIn PDF document text
    • https://s3.amazonaws.com/waxegatulo/fanularopuxuxixazofitaja.pdfIn PDF document text
    • https://s3.amazonaws.com/vuzufexarevima/60864671412.pdfIn PDF document text
    • https://s3.amazonaws.com/ruzumeb/comdial_dx_120_user_guide.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_off000104d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104D8 5084 bytes
SHA-256: 6f76227e515fdfc1ceda4a14fcd41a417c2221958fe5d7ef80cc3ea405bcea17
font_01_sfnt_off00011647.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11647 10940 bytes
SHA-256: 4b57c3c8c6bf043304b6444727c3b73d9541bf933af9ef8e35be26ca10e10982

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