Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebbb7d8cddbdf393…

MALICIOUS

PDF

76.6 KB Created: 2021-03-17 11:35:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b022673aaca42b5997fc8bf47ce8be9f SHA-1: 1b8cbc8b036f8c7f47ed4318a1d0160784eeecfe SHA-256: ebbb7d8cddbdf3932388e5790924ba978c60883e282d2d7ac671457e679041ae
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm and is flagged by ClamAV and a machine learning classifier as malicious. The heuristic 'SE_ADVANCE_FEE_SCAM_LURE' indicates the document's content is designed to trick users into believing they will receive a prize or parcel, which is a common advance-fee fraud tactic. The primary malicious link is embedded within the document body, disguised as a search result.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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://jacksth.ru/strik?utm_term=what+time+does+starbucks+close+during+covid
    • http://jodazok.22web.org/wing_chun_illustrated_magazine.pdf
    • https://rugoxeribagiwa.weebly.com/uploads/1/3/4/5/134529694/pisuvede-vifegojesix-biwimarakagoge-girupazozadi.pdf
    • https://mazefitarunakur.weebly.com/uploads/1/3/1/4/131453858/2304090.pdf
    • http://juzajikadig.22web.org/que_es_bulimia_y_anorexia.pdf
    • https://sajozigita.weebly.com/uploads/1/3/0/8/130814351/timumaterosewibepof.pdf
    • https://gobewuguwug.weebly.com/uploads/1/3/6/0/136056794/kajubapa_puvevujutu.pdf
    • https://rinadulig.weebly.com/uploads/1/3/0/7/130739308/kipuwarutabuwox_tatewami.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/wifukedot/coleman_powermate_3250_generator_manual.pdf
    • https://a82c121c-2200-4cd7-aff6-47cf910fdadb.filesusr.com/ugd/117c17_dfb036905d204eefad75e36ba9e5a6b3.pdf?index=true
    • http://jolafefiluw.rf.gd/bollywood_mkv_hd_movies.pdf
    • https://769966b8-4adc-437e-bba8-f198cf6e171b.filesusr.com/ugd/41a0b6_be0e621271b84a3eaa35be266a401d12.pdf?index=true
    • http://xamawesurasido.epizy.com/78220855749.pdf
    • http://fomajunelafid.epizy.com/84882697448.pdf
    • https://s3.amazonaws.com/kefefetafij/allgemeine_summenformel_von_carbonsuren.pdf
    • http://xuzatazuji.epizy.com/silhouette_cameo_3_software.pdf
    • https://cfecb619-c0f5-418d-ae9d-b1147643389f.filesusr.com/ugd/4cd51e_c91bdeb070ad45c5af49b0f264a818fe.pdf?index=true
    • https://49432a94-54bc-4d13-9d12-ea41d731e1b8.filesusr.com/ugd/a7c689_d01f77b8c54348ada56400aea8a60113.pdf?index=true
    • https://s3.amazonaws.com/mafavuzenoliki/washington_gas_light_company_jobs.pdf
    • https://s3.amazonaws.com/jotogorurekuro/turtle_beach_x12_buzzing_noise_pc.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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec32.bin
ecf7f6fd0c05c2fb72f99010683fd664e8a597bba14c06d17dbd7510bb535ed5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC32 5632 bytes
font_01_sfnt_off0000ff39.bin
5991b9193083b45d9a9fd99309125fdf147b50450879d6f783c640ee6147a65a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF39 11072 bytes

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