Malicious PDF — malware analysis report

Static analysis result for SHA-256 591920f3d383be9b…

MALICIOUS

PDF

81.9 KB Created: 2021-03-11 04:27:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 00960a601db813e66001beeca5cebcab SHA-1: 393950f7fc4fcb314cab0e8ed0955cff9ab6dc8c SHA-256: 591920f3d383be9bd88f5f6b1323531c62e4cf59ee26a355e1fd517873f1dc59
136 Risk Score

Malware Insights

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

The PDF contains multiple suspicious links, with one specifically identified as an invisible lure pointing to a domain that hosts a PDF file. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body, though heavily obfuscated, contains keywords related to taxes, suggesting a lure to trick users into downloading a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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/wix?keyword=impuesto+sobre+la+renta+guatemala+2019 PDF link annotation
    • http://rodina38.ru/appraisal_letter_format_to_boss1dhnf.pdfIn PDF document text
    • http://legiontry.online/synology_ds1515_resistor_fixve05t.pdfIn PDF document text
    • http://pressit.space/uni-_t_ut61ex2akg.pdfIn PDF document text
    • http://all-system7.work/12_months_of_the_year_worksheetifb3s.pdfIn PDF document text
    • http://managerprogram.live/kuch_kuch_hota_hai_mp3_song_free_doww3p38.pdfIn PDF document text
    • http://mevukavotidu.getenjoyment.net/kaviporinamanijozun.pdfIn PDF document text
    • https://wusulanapezuvu.weebly.com/uploads/1/3/4/3/134325740/rowulojimesivibuv.pdfIn PDF document text
    • http://nikecortez.net/95988913583hlvm4.pdfIn PDF document text
    • https://bagesasadav.weebly.com/uploads/1/3/4/3/134383367/xuwomufus.pdfIn PDF document text
    • https://kimiligemapi.weebly.com/uploads/1/3/4/3/134343210/e8f81.pdfIn PDF document text
    • https://fafotarume.weebly.com/uploads/1/3/1/0/131069904/falefe_jelinub_zamor_zoweva.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/tobobowu/nodanidawodoza.pdfIn PDF document text
    • http://luvabokinoleg.onlinewebshop.net/simple_past_tense_verbs_list.pdfIn PDF document text
    • https://s3.amazonaws.com/tamovagag/shark_rotator_professional_lift_away_brush_roll_not_working.pdfIn PDF document text
    • https://s3.amazonaws.com/kiremefegonar/akasam_enduko_song.pdfIn PDF document text
    • https://s3.amazonaws.com/bawalidamovidud/baxijujugidenun.pdfIn PDF document text
    • https://s3.amazonaws.com/megodipewukitoj/oster_burr_grinder_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/zalisujezajaje/7955352977.pdfIn PDF document text
    • https://s3.amazonaws.com/rebesudanolo/78753184499.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_off0000f336.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF336 5532 bytes
SHA-256: b9fda26a3d595dc8d34c024c88b93c485e5b15fa6475bdc4206afe93844c2c09
font_01_sfnt_off000105e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105E4 11740 bytes
SHA-256: d808f47ad2af4e42f24db630c597b61d337a26c2df8e5c20a9b13ddd7c091754
font_02_sfnt_off00012bba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BBA 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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