Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7cef25cf283821f…

MALICIOUS

PDF

79.9 KB Created: 2021-05-10 13:30:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c7ba5c1fc3a7db5d957b90d5c1dab8b7 SHA-1: 94ca6e040acf652afaa811aef227835aa21fe555 SHA-256: f7cef25cf283821fbb8f42a5a4a91d8e7741c8d783e91d043b56b12a9b5602cd
96 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to 'dafemum.ru', which is likely a malicious domain used for phishing or distributing further malware. The document body, though heavily obfuscated, contains keywords related to weight loss, suggesting a lure to entice users to click the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://dafemum.ru/strik?utm_term=does+bbg+make+you+lose+weight
    • https://cdn-cms.f-static.net/uploads/4368244/normal_605aa4309563b.pdf
    • https://cdn.sqhk.co/safovokon/rigZUif/15352533220.pdf
    • https://cdn.sqhk.co/nilesatu/gejfPgd/10551997739.pdf
    • http://xulubapatoso.scienceontheweb.net/jezaraxupimegonadotu.pdf
    • https://cdn-cms.f-static.net/uploads/4458150/normal_5fd7b93224908.pdf
    • https://cdn.sqhk.co/letijefa/dZ94gAb/zadinizadipoburozugiwumi.pdf
    • http://vajesafosedepur.mywebcommunity.org/abnormal_psychology_an_integrative_approach_8th_edition_free_download.pdf
    • https://cdn.sqhk.co/xolizoxime/ihbDieb/ages_and_stages_4_years.pdf
    • https://static.s123-cdn-static.com/uploads/4483839/normal_6007a2f36a1d5.pdf
    • https://cdn-cms.f-static.net/uploads/4410016/normal_601805fc6ec2e.pdf
    • https://cdn-cms.f-static.net/uploads/4421983/normal_6023fd8602fc2.pdf
    • https://cdn.sqhk.co/rifarako/iiegh65/luxarekusixen.pdf
    • http://bivozebavi.iblogger.org/kagixonepexusudare.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/tuletivotarupu/incident_report_writing_scenarios_correctional_officer.pdf
    • https://uploads.strikinglycdn.com/files/dc0d943b-b9aa-46f6-b9b9-bed04159349b/contabilidad_de_costos_juan_garcia_colin.pdf
    • http://gamugeko.rf.gd/joboli.pdf
    • https://uploads.strikinglycdn.com/files/eee21384-46da-4083-a432-6bdb1ddee111/what_are_spiny_water_fleas.pdf
    • https://uploads.strikinglycdn.com/files/2ed83516-c289-432d-98d2-c8f229c698ef/88755400372.pdf
    • http://xevorerokune.epizy.com/kosini.pdf
    • https://s3.amazonaws.com/zazelujeju/homonyms_worksheet_3rd_grade.pdf
    • http://sidegiri.epizy.com/20889437618.pdf
    • https://uploads.strikinglycdn.com/files/320c5e84-cc5e-45ec-bf07-859654e67306/75428813853.pdf
    • https://s3.amazonaws.com/sowewazulejewi/auvio_bluetooth_speaker_power_cord.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef4d.bin
801765f06a71d118db3f85c137a401d5dfcbacec94ccadc729f88cc360b58bdb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF4D 5400 bytes
font_01_sfnt_off0001019c.bin
a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1019C 1800 bytes
font_02_sfnt_off00010a29.bin
2e3dbc232c7a7384238e3eb9d8b5fcf75e8848b63eae2d6509549cc912edb01b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A29 11144 bytes

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