Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef7114b33d26e3f0…

MALICIOUS

PDF

81.5 KB Created: 2021-03-28 08:52:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 52cbf2b42b1ea07ad17c48173a318a35 SHA-1: eeed1fa84fef95dc42fa5658710fd879adc8f07f SHA-256: ef7114b33d26e3f0316106687c0cf79817c54a99757b993a46e3cb2b0e053226
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic. The primary URL, 'https://nipisod.ru/strik?utm_term=victorian+language+of+flowers+lily', and another linked PDF, 'http://datab.vip/android_notification_sounds_location124q9.pdf', suggest a phishing or malicious content distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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.
  • 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/strik?utm_term=victorian+language+of+flowers+lily PDF link annotation
    • http://datab.vip/android_notification_sounds_location124q9.pdfIn PDF document text
    • http://momopenuwawe.iblogger.org/64767083623.pdfIn PDF document text
    • http://flash-sar.online/will_the_wii_become_rarepgv1g.pdfIn PDF document text
    • https://pobejatu.weebly.com/uploads/1/3/2/7/132741278/totawaruwezufasagu.pdfIn PDF document text
    • http://teaitalis.space/43043830118e90ri.pdfIn PDF document text
    • https://zamomojufowa.weebly.com/uploads/1/3/4/6/134613680/xudasofes.pdfIn PDF document text
    • https://topalezomezo.weebly.com/uploads/1/3/4/3/134305389/kuliluxalagexiwijuz.pdfIn PDF document text
    • https://bozixezexa.weebly.com/uploads/1/3/4/8/134861503/def77c5510749.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/zowibatev/widixovidibavawe.pdfIn PDF document text
    • http://maruduxelukar.rf.gd/lasko_ceramic_tower_heater_with_remote_control_reviews.pdfIn PDF document text
    • https://321e46d8-a3e9-4523-905f-b0dcd1dcb7ef.filesusr.com/ugd/29fbc3_37d8c9e8af174aa3b80b28c96c6a9dfa.pdf?index=trueIn PDF document text
    • https://8c1dc56a-a131-4b43-acff-3635b9115217.filesusr.com/ugd/90423f_486314ea54c940c29bece29995139b2b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fojaxexino/18469395270.pdfIn PDF document text
    • http://puwojewemuxa.epizy.com/bkav_min_ph.pdfIn PDF document text
    • https://s3.amazonaws.com/nigimul/ableton_suite_free_full_version.pdfIn PDF document text
    • https://s3.amazonaws.com/ninasivol/shirley_jackson_scientist_biography.pdfIn PDF document text
    • https://19508648-7f28-415f-8121-b57715dc1465.filesusr.com/ugd/9734e7_c976b3b7f3294b749c616dfdefe553d7.pdf?index=trueIn PDF document text
    • https://98748e4b-3258-471a-903e-8ea98415cca0.filesusr.com/ugd/fd7405_fc616ad148ba4679b4b1e914cbc99994.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bivanud/titezu.pdfIn PDF document text
    • https://56c41596-c8b3-4aa7-a075-23c9724d7f97.filesusr.com/ugd/ed77b2_87ceb9ba27dd436197aad1d56d7585e9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mejawiwomak/nefowivisedo.pdfIn PDF document text
    • https://s3.amazonaws.com/pesetufavo/natakam_movie_telugu_free.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f652.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF652 5092 bytes
SHA-256: 80fa0b09a1de6160552f8bda82eb9cdff9fc3de1b1a9880ef0bf82cebf4105a6
font_01_sfnt_off000107c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107C5 10160 bytes
SHA-256: 3cde324f54edde09dd1a518a365d9cc8f021b869f954e1eb643fbc217a1d94f2
font_02_sfnt_off00012a7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A7E 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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