Malicious PDF — malware analysis report

Static analysis result for SHA-256 2aae199fd9a74701…

MALICIOUS

PDF

81.9 KB Created: 2021-09-08 22:22:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3c7eb52f9ded58469001b4bd3c609f6c SHA-1: 9f8828290564b3002701d0264d7aab9c9b1ffd76 SHA-256: 2aae199fd9a74701dadebd07fee9d01c93d9a434230513d59fa9d9fd9fd6655f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of multiple PDF files hosted on various domains suggests a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 http://ingegnasrl.com/userfiles/files/4546866134.pdf In PDF document text
    • http://kanoonkaraj.ir/dbmanager/filebank/htmlgallery/file///67717421799.pdfIn PDF document text
    • http://ineke-ott.nl/keramiek-beelden-imagesfile/70535265638.pdfIn PDF document text
    • http://illinoislivestock.org/userfiles/file/jedisujomam.pdfIn PDF document text
    • http://vendsol.com/userfiles/file/25506180730.pdfIn PDF document text
    • https://bold-iot.com/uploads/files/202109012359219748.pdfIn PDF document text
    • http://h04ydivan.ru/userfiles/file/xuwapoxejojekotu.pdfIn PDF document text
    • https://deitratech.com/userfiles/file/gaguviv.pdfIn PDF document text
    • http://newabel.com/ckfinder/userfiles/files/47833041837.pdfIn PDF document text
    • http://xn--b1adrijbbb.xn--p1ai/upload_picture/xexuwasutigiwidetagofivez.pdfIn PDF document text
    • http://bobmeetin.com/media/galleries/files/tukudelutawibozuvumo.pdfIn PDF document text
    • http://letsbelegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xixozevivulonil.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16131aefb48115---gukorolexoled.pdfIn PDF document text
    • http://ansing.nl/userfiles/file/77335676087.pdfIn PDF document text
    • https://blnk.eu/userfiles/files/gebawosirudanivuze.pdfIn PDF document text
    • http://thaoduoconline.com/userfiles/image/file/zobijox.pdfIn PDF document text
    • https://777mto.org/contents/files/71004278503.pdfIn PDF document text
    • http://eyela.kr/uploadfile/fckeditor/file/38919029710.pdfIn PDF document text
    • http://dtmaso.com/public_html/Imagens/file/14537521822.pdfIn PDF document text
    • https://vettercycles.ch/userfiles/files/28154203068.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612efd47ddeb8---vazumuvonunokatokelamoxob.pdfIn PDF document text
    • https://total-sport.pl/img/upload/files/zimugobupo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=marvel+future+fight+apk+mod+latest+versionPDF 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_off0000da7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA7D 17568 bytes
SHA-256: 4c39350255261a65f5c089bf04c920d0256eb02460e9e5f24d0812e9c88cd2b3
font_01_sfnt_off0001082b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1082B 11196 bytes
SHA-256: dd9bccbf9458a90216f536e7b5c453d2460a27b05953e61300913b1e39bc26b2
font_02_sfnt_off000121fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1