Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7d044c61c3feff0…

MALICIOUS

PDF

67.2 KB Created: 2020-11-19 05:12:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: d6973731695ddd9ec92551a2ab8afcff SHA-1: 6dfad820e932788f028d0d958bd4086e04cad7b5 SHA-256: b7d044c61c3feff04abd77bdca3d1229e8c3dc3805cecf95d1a7b1c995fa39a1
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded links, with at least one pointing to known malicious redirector infrastructure. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_LINK_FARM indicate a pattern of linking to external sites, likely for phishing or malware distribution. ClamAV also detected this file as a phishing trojan.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://ggtraff.ru/strik?utm_term=how+to+print+t+shirts+for+fun+and+profit In PDF document text
    • https://mavobomuwatu.weebly.com/uploads/1/3/4/5/134592479/xadezezogo.pdfIn PDF document text
    • https://gixapogaruxa.weebly.com/uploads/1/3/4/3/134331356/wurijosud_zijukege_tipejikisef_bigaworuzile.pdfIn PDF document text
    • https://dekobela.weebly.com/uploads/1/3/4/3/134332871/polonos.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/5245b665-bcec-4414-a109-f5b5425665d3/yes_player_app_download.pdfIn PDF document text
    • https://s3.amazonaws.com/rezugekolaba/nevedelo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a56733e-3752-42ca-81db-41971922ca9d/masks_hollow_knight.pdfIn PDF document text
    • https://s3.amazonaws.com/zaxawetawupo/jikas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ffe2e003-4159-4926-86ac-3b75abc5049d/rigaturad.pdfIn PDF document text
    • https://s3.amazonaws.com/gavexilatuvitaz/57513276548.pdfIn PDF document text
    • https://s3.amazonaws.com/vavejijitatofu/73843908174.pdfIn PDF document text
    • https://s3.amazonaws.com/nokiva/nudiwerosofewo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a83decd-8719-40ce-a24c-32bfcf7797b0/palette_of_narmer_hat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/361c9d13-53b4-4f3c-a93a-5eee1b618ef4/wagufevitepuneluliminuf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae5289d3-5518-41b4-bf81-85c1cc76634e/92410054295.pdfIn PDF document text
    • https://s3.amazonaws.com/zupenafud/7-3_guardian_tales.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_off0000cb14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB14 5152 bytes
SHA-256: 92ac4a013231198df07156afb0918b3c5b9e1139ba94d6485567c999fe14e262
font_01_sfnt_off0000dca6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCA6 10272 bytes
SHA-256: f0d21b64577028229eaa52ebd76515a46586ed932dfb65c4fe34281d400df53d

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