Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3a946435c796baa…

MALICIOUS

PDF

92.6 KB Created: 2021-02-10 22:56:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 5bd301c1f092b88d7007570ab49aefa9 SHA-1: d226c975666d533f7fbe804c05a3d898dd4980ac SHA-256: c3a946435c796baad026f97ab8e71f32ec496a744fe91db78f8d74741503cdd8
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains or link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though heavily obfuscated, appears to reference 'Google Drive' and 'wkhtmltopdf', likely as a lure to disguise the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://leonvi.ru/123?utm_term=bajo+la+misma+luna+google+drive PDF link annotation
    • http://kupivse.xyz/mitalusoruxabulokbmqn.pdfIn PDF document text
    • https://nerapusu.weebly.com/uploads/1/3/1/4/131438180/kujotolawujoru.pdfIn PDF document text
    • http://fsfsfd.xyz/descargar_libro_el_12_planetalobkd.pdfIn PDF document text
    • https://cdn.sqhk.co/medukukekuke/Yhfgjhd/dijujovabosigasajikumopi.pdfIn PDF document text
    • https://venewosusi.weebly.com/uploads/1/3/1/3/131398385/pinuvitifepiwija.pdfIn PDF document text
    • http://it50life.pro/java_windows_8_64_bitmhmki.pdfIn PDF document text
    • https://cdn.sqhk.co/puvegipuros/jihicAw/35619023750.pdfIn PDF document text
    • http://helplnstagramcontact6088757.com/sufjan_stevens_ukulelesea7r.pdfIn PDF document text
    • http://xteenware.online/the_science_of_likabilityiv465.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470223/normal_6005260a389db.pdfIn PDF document text
    • http://igafnd.org/perfect_violin_sheet_music_musescore2lkty.pdfIn PDF document text
    • http://tameeniraq.com/39587122663dl9ks.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376404/normal_60100158365af.pdfIn PDF document text
    • https://gifetapajuloper.weebly.com/uploads/1/3/4/6/134682222/8316730.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408190/normal_5fcb347c41fac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370744/normal_5fd6351794119.pdfIn PDF document text
    • https://tulovituvo.weebly.com/uploads/1/3/4/2/134234708/sebekeju.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
    • 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_off0001192c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1192C 5132 bytes
SHA-256: e98aa1a0f8e7c47bb5b1b1df1e924e1338c7f23e4aac76d1c6c96e991c979f10
font_01_sfnt_off00012a81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A81 13104 bytes
SHA-256: e1e12cacb192ec0580c765a60cbcaaa8343420c5ff9adf173cb823ea5171e799
font_02_sfnt_off00015564.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15564 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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