Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbf03a7760902e80…

MALICIOUS

PDF

66.6 KB Created: 2021-02-12 12:11:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: e8812bdb3f4bcbc4ed77cab39bdf91cc SHA-1: 76150b5f9a2e978b7f8821fa35cc304e74f2c8db SHA-256: cbf03a7760902e80ee72aae73092f5b2ba608e32b75675c3abe6f2c2972832d3
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are SEO-optimized and point to other PDF files, suggesting a link farm or phishing operation. The primary URL, 'https://baarspo.ru/123?utm_term=wentzville+school+district+covid', is suspicious and likely leads to a malicious site. The ClamAV detection and ML classifier further support the malicious nature of this document.

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://baarspo.ru/123?utm_term=wentzville+school+district+covid PDF link annotation
    • https://woxigixekamut.weebly.com/uploads/1/3/0/7/130739530/rivomulujorazupemat.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460446/normal_5fe2b456cf45f.pdfIn PDF document text
    • https://cdn.sqhk.co/dezosanag/ic5jiji/dream_girlfriend_mod_apk_1._0._31.pdfIn PDF document text
    • https://raguwagoneneza.weebly.com/uploads/1/3/1/3/131384547/pixuvarof_fuputupu_bivunelokudoxuz.pdfIn PDF document text
    • https://damemerivojed.weebly.com/uploads/1/3/4/3/134378109/mujawovadidek.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482849/normal_5fc9615e3fe39.pdfIn PDF document text
    • http://neliwiveles.22web.org/xuvafisuvakamoxu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479210/normal_6021bf2984343.pdfIn PDF document text
    • https://zujomesesewega.weebly.com/uploads/1/3/4/9/134902804/ff8c6b7564890db.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451971/normal_5fdc273678733.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
    • https://s3.amazonaws.com/teximikamukubo/zopapululodepopujigi.pdfIn PDF document text
    • https://s3.amazonaws.com/fekaduvopigab/asuran_movie_songs_bgm_free.pdfIn PDF document text
    • https://s3.amazonaws.com/ratixifo/fomubizumedinotuzew.pdfIn PDF document text
    • https://s3.amazonaws.com/supefujoxopubu/aadukalam_1080p_video_songs_free.pdfIn PDF document text
    • https://s3.amazonaws.com/satedafadusizo/laluzobo.pdfIn PDF document text
    • http://xasonivuk.epizy.com/chintakayala_ravi_video_songs_mp4.pdfIn PDF document text
    • https://s3.amazonaws.com/dosipive/coliformes_en_aguas_residuales.pdfIn PDF document text
    • https://s3.amazonaws.com/sefiwegegagu/zufelurapebusisuj.pdfIn PDF document text
    • https://s3.amazonaws.com/juduk/lozabokuzo.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bcfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCFB 4728 bytes
SHA-256: ebc7b46b0885817c29275e373c2622b05a1ca0445876f5f34a26f9b77e9c86ff
font_01_sfnt_off0000cd11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD11 10004 bytes
SHA-256: 2e36944b69d6bb629654c3ab04b0376bdced23d7165cfe1103beaf2b1eac45b4
font_02_sfnt_off0000ef2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF2E 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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