Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f9f5a28e255b678…

MALICIOUS

PDF

73.0 KB Created: 2021-01-19 22:49:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 7560febc5282a01a94aad53cdfad2eda SHA-1: 6c942cca258b33cc25cd4bb7a17c137b6692e3d5 SHA-256: 5f9f5a28e255b678ac34f88630c9710dad6a711b27cf87b5d4aec76a9340564a
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of external links, many of which point to other PDF files, suggesting a link farm or redirection mechanism. The document body, though heavily obfuscated, contains text related to 'victory worship songs lyrics and chords' and wkhtmltopdf, indicating a potential lure to disguise malicious activity. The presence of numerous external URLs strongly suggests an attempt to redirect the user to malicious sites.

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
  • 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.
  • 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://traffnew.ru/wb?keyword=victory%20worship%20songs%20lyrics%20and%20chords PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4460263/normal_5fe6d434df5ae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386842/normal_5fad3439c34bb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426415/normal_5f99817963039.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475559/normal_5ff8651074b78.pdfIn PDF document text
    • https://fakivafepupu.weebly.com/uploads/1/3/0/8/130873921/9753397.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484804/normal_5fb255bf68349.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472200/normal_5fdb248bb7791.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374196/normal_5f94de4e42149.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409093/normal_5fcd99fcea9a0.pdfIn PDF document text
    • https://vidajubobulixi.weebly.com/uploads/1/3/4/6/134650234/b21b77959f99f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382197/normal_5fd108348a371.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420747/normal_5fbb33f8dbe62.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464522/normal_5fa38717cadac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481056/normal_5fd275dd4bc97.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/serogajugomiji/bdo_online_registration_form.pdfIn PDF document text
    • https://s3.amazonaws.com/xamapebonijos/duracell_aa_battery_datasheet.pdfIn PDF document text
    • https://s3.amazonaws.com/kozibowisenatu/boatsmart_study_guide_book.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_off0000deec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEEC 5492 bytes
SHA-256: 1b619261fd10539348ba7e2343f8d0ed0db844db7b24dedb7b58bcb5758f2166
font_01_sfnt_off0000f1b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B4 10912 bytes
SHA-256: 7768cd23ea71191e8c3ea8febcd3e2578745d11e3dc209d40644e41d47750390

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