Malicious PDF — malware analysis report

Static analysis result for SHA-256 579af309c8ba9707…

MALICIOUS

PDF

63.5 KB Created: 2021-02-14 10:39:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: a24948c52fdf46ae342cf458f61817cf SHA-1: 283209f2395b0d9f040d71f2421a52b4f75ec3b5 SHA-256: 579af309c8ba9707325ee5eef4d3348127e1b5a3b5cf65c3d06c7887fd3bfe1d
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic firings reveal it contains a large number of external links, suggesting it's part of a link farm or phishing campaign. The presence of 'powershell_tutorial_downloadly0n3.pdf' in the document text hints at potential execution of commands, possibly involving PowerShell, to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://maypoin.ru/123?utm_term=words+beginning+with+jaw PDF link annotation
    • https://munemajof.weebly.com/uploads/1/3/2/3/132302982/tinokunuxaguz_wedife_fozopudexi_robufugi.pdfIn PDF document text
    • http://lovechat24.club/twilight_saga_breaking_dawn_2_songsk7m5r.pdfIn PDF document text
    • https://cdn.sqhk.co/fajaleniwa/njfgian/girl_next_door_song_when_they_kiss.pdfIn PDF document text
    • https://cdn.sqhk.co/fixiwuwukufi/bgj5jgG/bombardier_hitachi_merger.pdfIn PDF document text
    • https://lugoponogib.weebly.com/uploads/1/3/4/4/134404253/ravureg.pdfIn PDF document text
    • https://tedawubav.weebly.com/uploads/1/3/4/3/134376018/bonaninovefujiro.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4498992/normal_5fc7c9da87a9c.pdfIn PDF document text
    • https://cdn.sqhk.co/xafiguzi/6LAhbrE/initial_drift_ps4.pdfIn PDF document text
    • https://zagibekopawof.weebly.com/uploads/1/3/1/4/131453283/1731392.pdfIn PDF document text
    • https://verikadofaja.weebly.com/uploads/1/3/2/3/132303102/2178386.pdfIn PDF document text
    • http://lotsmen.com/powershell_tutorial_downloadly0n3.pdfIn PDF document text
    • https://novomuzedideb.weebly.com/uploads/1/3/1/4/131406537/miden.pdfIn PDF document text
    • https://s3.amazonaws.cIn macro / runtime command snippet
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jinotugiwomo/92776163243.pdfIn PDF document text
    • https://s3.amazonaws.com/mexavofezoxi/scratch._mit._edu_2._0.pdfIn PDF document text
    • https://s3.amazonaws.com/dosipive/backward_design_template_for_unit_planning.pdfIn PDF document text
    • https://s3.amazonaws.com/wanalovum/6959429691.pdfIn macro / runtime command snippet
    • 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_off0000ba8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA8B 5376 bytes
SHA-256: d43adfe53334d482ddaed2c986e7a07076cd5bc4379326f4836f792bf26758b6
font_01_sfnt_off0000cce9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCE9 10744 bytes
SHA-256: 31e71148920e6a7ec64f366b93bd860b170ec29969b392b49d5d30b33c8da360

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