Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a08be3ace0f8ed3…

MALICIOUS

PDF

76.8 KB Created: 2021-03-02 14:40:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 7c0ba156284bdf9ed1e8dc5de378905d SHA-1: 7e156eacea433f0d68780c1d30a4d07f77de4d41 SHA-256: 5a08be3ace0f8ed3f3fe0c03285330551b8903603e36301bec306be1683203fd
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically related to phishing. While no scripts were explicitly extracted, the presence of numerous external URLs points towards an attempt to redirect the user to malicious content or phishing 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://jumiwimov.ru/wix?keyword=el+niagara+en+bicicleta+historia PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4449992/normal_6034ce0895e5e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445731/normal_601473a1e2d1b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446784/normal_5fe08dad204a7.pdfIn PDF document text
    • https://keduwiwisa.weebly.com/uploads/1/3/4/4/134486116/51bbb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463005/normal_600731106dfba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365638/normal_5fd2d8740ae12.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493876/normal_602e7c6ef141b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412591/normal_601a3e1b3be79.pdfIn PDF document text
    • https://fajimidisuwa.weebly.com/uploads/1/3/1/6/131606183/3054864.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392215/normal_600d2914c5263.pdfIn PDF document text
    • https://cdn.sqhk.co/xijogedobu/ihjhjhb/baby_toilet_training_seat_bunnings.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/legobegutulo/hungry_shark_evolution_mod_apk_oyun_indir.pdfIn PDF document text
    • https://s3.amazonaws.com/muxozuvalubi/73741013493.pdfIn PDF document text
    • https://s3.amazonaws.com/fowonaxul/arere_manase_song_ringtone.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_off0000eadc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEADC 5160 bytes
SHA-256: b2e1e962f090de80be445b704e7ffe36e0aa349992c350165b5cc5919721cbc0
font_01_sfnt_off0000fc62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC62 12448 bytes
SHA-256: 0389e02a21b9f1bebc0816f683ca0e404f4954870d5bf38ea1fa63403746d5b0

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