Malicious PDF — malware analysis report

Static analysis result for SHA-256 f88f458db71f11ca…

MALICIOUS

PDF

72.6 KB Created: 2021-04-05 06:10:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 9c6fe848e7a3248c38e75a233bd9e4be SHA-1: 56627d00220705d094e39888793d8a5e6b75e7ae SHA-256: f88f458db71f11ca4cbc19c462f93f76cbed83899affa305ee1732051474031f
96 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains an embedded URI pointing to 'https://xajibur.ru/award?keyword=medical+encyclopedia+book+pdf', suggesting a phishing or malware distribution lure disguised as a medical encyclopedia. No scripts were extracted, but the presence of external URLs and the overall detection score strongly suggest a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://xajibur.ru/award?keyword=medical+encyclopedia+book+pdf PDF link annotation
    • http://sethel.xyz/big_mouth_and_ugly_girl_summary_chapter_21mdf7p.pdfIn PDF document text
    • http://7evenrp.ru/95958693626hfrx7.pdfIn PDF document text
    • http://rezonansmusic.com/411553609025qa2f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zamemigojat/70922126362.pdfIn PDF document text
    • https://s3.amazonaws.com/kotidox/what_does_it_mean_when_your_rabbit_chases_you.pdfIn PDF document text
    • https://s3.amazonaws.com/gudukupir/properties_of_pure_substances_thermodynamics_notes.pdfIn PDF document text
    • http://buxamojajowolos.rf.gd/27950751150.pdfIn PDF document text
    • https://s3.amazonaws.com/pafiganovavi/britannica_visual_dictionary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98d5f377-4958-4004-99fb-abdaa1aa5b27/what_a_beautiful_family_quotes.pdfIn PDF document text
    • https://s3.amazonaws.com/punurum/gisakawawexerizuwafop.pdfIn PDF document text
    • http://sogilotewi.rf.gd/7924711743.pdfIn PDF document text
    • https://s3.amazonaws.com/jotogorurekuro/duwejurewusuwo.pdfIn PDF document text
    • https://s3.amazonaws.com/libosokune/21322924873.pdfIn PDF document text
    • https://s3.amazonaws.com/bewibiwat/how_to_work_the_health_o_meter_scale.pdfIn PDF document text
    • https://s3.amazonaws.com/bipepezuwed/razer_blackwidow_change_switches.pdfIn PDF document text
    • https://s3.amazonaws.com/babetafaperaxov/bevorzugter_netzwerktyp_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4926574-67e3-4761-ada0-31a28ed5e770/4175264036.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_off0000dd97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD97 5184 bytes
SHA-256: cd8dc045d3244a60295f024c9aa7e11ac6b3c5e7802ab39e220a3ed5a5e39bc9
font_01_sfnt_off0000ef66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF66 11144 bytes
SHA-256: 9e23df592f5f5a134a186c733ed4837fb59cbfadf0202b7985c05b6c15ad6ba1

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