Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d871e5f155c4920…

MALICIOUS

PDF

80.4 KB Created: 2021-09-20 12:27:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 58f12842c7db0870981823bc865c4921 SHA-1: 243acca91298b249cb0abc53f9efa8af52be3def SHA-256: 4d871e5f155c49200f4ce0c2250af698114d3ca9c2562a532b5c4f5a1fa0183b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs and is flagged by ML classifiers and ClamAV as malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a large number of links pointing to potentially malicious or phishing sites. While no scripts were explicitly extracted, the nature of the embedded URLs suggests a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://schachverein-marchhoefe.ch/fcsr/news/upload/file/9308530905.pdf In PDF document text
    • https://juvelyrikoscentras.lt/Files/file/tenesudezom.pdfIn PDF document text
    • http://centronegozi.com/public/85526232704.pdfIn PDF document text
    • https://incoyun.com/calisma2/files/uploads/sotom.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/135e9838aea45a66fcac3e6dc5383947/xoxemofafut.pdfIn PDF document text
    • http://findacommodity.com/upload/file/96555551809.pdfIn PDF document text
    • http://jaluzipro.ru/public/userfiles/file/zugatepibi.pdfIn PDF document text
    • http://reklama-kemerovo.ru/files/files/40315293183.pdfIn PDF document text
    • https://kamwalibais.com/userfiles/file/bosamoxajopoguka.pdfIn PDF document text
    • https://thietbixanh.net/uploads/files/46675504672.pdfIn PDF document text
    • http://rivebistro.net/ckfinder/userfiles/files/33511333198.pdfIn PDF document text
    • http://licausi.it/userfiles/files/73917360030.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/a08e711b02987324ac49a0697fbf08e3/sewekiwirowivezeben.pdfIn PDF document text
    • http://studioscoponi.eu/userfiles/files/38877768740.pdfIn PDF document text
    • https://derfo.info/resimler/files/71036772385.pdfIn PDF document text
    • https://chulintemple.house-well.com/CKEdit/upload/files/71107738834.pdfIn PDF document text
    • https://zhansq.cn/upload/file/jipoxeropapokizuvigamo.pdfIn PDF document text
    • http://kelakewangshangduchang.a9188.com/upload_files/art_files/files/20210913_183057.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/sojotebifozit.pdfIn PDF document text
    • http://epwuae.com/userfiles/file/79280918442.pdfIn PDF document text
    • http://studiopol.it/userfiles/files/86812437782.pdfIn PDF document text
    • http://windmill-bv.com/userfiles/files/34664027925.pdfIn PDF document text
    • http://chuabenhxuongkhop24h.com/images/files/35347310169.pdfIn PDF document text
    • http://mp-journal.com/media/file/79609676266.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=twilight+new+moon+full+movie+online+123moviesPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d681.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD681 10960 bytes
SHA-256: e423e411328add2d7ccd87be20a25660787070e7acc39c1fc180bbd6d01cdea8
font_01_sfnt_off0000efec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFEC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000107fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107FE 17140 bytes
SHA-256: ed214931f2bb267065122b848a96abcba633cb655db2ab00a88b472cd76b3640

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