Malicious PDF — malware analysis report

Static analysis result for SHA-256 ade894d3ca5db07a…

MALICIOUS

PDF

80.5 KB Created: 2021-09-18 21:24:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ab343058f3293bf54e419304d01a06f5 SHA-1: d2d3a2744549dbce68adb5c4b914cfebfb542f8c SHA-256: ade894d3ca5db07a8939b504b1141bc81ccee0d97e8bd34cf86da3048f346a9e
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier with high confidence. The PDF contains numerous external URIs pointing to disposable hosting, indicating a link farm designed to redirect users to malicious content. The presence of multiple distinct hosts and UTM parameters suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://inwebjor.ru/uplcv?utm_term=friday+the+13th+free+download+for+android PDF link annotation
    • http://inkjetartandimage.com/Uploads/file/dafogedikavuvesejufu.pdfIn PDF document text
    • https://tahitotfaluovodak.hu/ckfinder/userfiles/files/biwavumotabaku.pdfIn PDF document text
    • https://xn--b8qxb801j.tw/upload/files/doviworaxotig.pdfIn PDF document text
    • https://wangwangcamp.com/uploads/files/202109020229361421.pdfIn PDF document text
    • https://aashianarealty.com/file/78787971875.pdfIn PDF document text
    • https://themis-lex.com/userfiles/files/keregit.pdfIn PDF document text
    • http://bhartiyambeohari.in/userfiles/file/sojovixekewajixopiriduwa.pdfIn PDF document text
    • http://szyoujin.com/UploadFile/file/20210918072438788.pdfIn PDF document text
    • http://modernplating.com/userfiles/file/tarekerurud.pdfIn PDF document text
    • https://dunaweb.co/bg_image/files/nugoxafekujiligibabesal.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/pumovifadekebojixo.pdfIn PDF document text
    • http://dellalontra.it/userfiles/files/zojodapivilevarosanono.pdfIn PDF document text
    • https://stmpallet.com/ckfinder/userfiles/files/21358966931.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/0b609c6a7a9e06f56f62912a34a60814/76923842286.pdfIn PDF document text
    • http://massimosusto.eu/userfiles/files/32767039582.pdfIn PDF document text
    • http://centonze-vini.com/userfiles/files/25786543171.pdfIn PDF document text
    • http://otoozevran.com/resimler/files/3501030350.pdfIn PDF document text
    • https://costabravas.com/uploads/localidades/files/kidadibidoxatawepi.pdfIn PDF document text
    • http://bebelino.ru/userfiles/file/vazekadegupoxizopofo.pdfIn PDF document text
    • http://premiercontainerlines.com/media/ftp/file/tenivodunawi.pdfIn PDF document text
    • http://poptheme.cn/uploadfile/files/20210918_095055.pdfIn PDF document text
    • https://aventura-agence.lu/userfiles/files/wogofiluwi.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1614525ac7acf8---turakikipake.pdfIn PDF document text
    • https://ispartaorganizasyon.com/ckfinder/upload/files/64933970026.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://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_off0000ce97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE97 20108 bytes
SHA-256: e14b985724db1ae5bb75318c12deb86ea7fcff460e1ae3419e1cfa29851962f1
font_01_sfnt_off000103d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103D1 10684 bytes
SHA-256: 2b1ffb09162884b61d7270789cd293eaa436c2c2b82c5f95e23b9fa53b9c6feb
font_02_sfnt_off00011c4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C4F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1