Malicious PDF — malware analysis report

Static analysis result for SHA-256 a499bd37419bfd8a…

MALICIOUS

PDF

70.4 KB Created: 2021-09-29 09:55:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 576ced3c67667cc8fb81fec5becfb333 SHA-1: 757aade6a4405513e39c0bcd5bac693a86445799 SHA-256: a499bd37419bfd8a2ce13bab1cc7d6f8fefd2a0c96378f7b2cb8c51dc43e394d
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many of which point to disposable domains and are flagged as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pistant.ru/uplcv?utm_term=gtv+live+sports+app+download PDF link annotation
    • http://cardealer-space.com/js/upload/files/34857843646.pdfIn PDF document text
    • https://felixtrail.com/imagini_ws/vatujire.pdfIn PDF document text
    • https://dusunceokulu.net/resimler/files/wamoroj.pdfIn PDF document text
    • https://cplastik.eu/data/cms/file/jorodigemuzalelikag.pdfIn PDF document text
    • http://iburgisidimarsala.eu/userfiles/files/gesibaduma.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/2021921835547222.pdfIn PDF document text
    • http://artetendasud.it/userfiles/files/lilolexun.pdfIn PDF document text
    • http://ambulatorioveterinariocigliano.com/userfiles/files/389344147.pdfIn PDF document text
    • https://www.suep.gr/ckfinder/userfiles/files/38805401044.pdfIn PDF document text
    • http://adice-area.com/pictures/files/81866743778.pdfIn PDF document text
    • http://lifecare4all.com/upload/files/dizovaxuwudazudamamive.pdfIn PDF document text
    • http://placc.info/up_image/72654773079.pdfIn PDF document text
    • http://namhungholdings.com/uploads/ckfinder/files/geduwutojimozaz.pdfIn PDF document text
    • https://optimuselearningschool.aels.edu/learning/site/images/uploadfiles/bizuxu.pdfIn PDF document text
    • https://medius.sk/userfiles/file/nodonedexuj.pdfIn PDF document text
    • http://cegled.varosom.hu/userfiles/files/litobexizemelokirud.pdfIn PDF document text
    • http://eperon-kochersberg.com/img_db/peguxinediwiwowasasuzesos.pdfIn PDF document text
    • http://lawyermo.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vikegeg.pdfIn PDF document text
    • https://perkunasstudio.com/uploads/files/202109220157074117.pdfIn PDF document text
    • https://ispartaorganizasyon.com/ckfinder/upload/files/38572737624.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/16132e67f5cf06---38710135068.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/ahrgdfudv3jlgel7gkgs0pu9kq/perilifasarazurutezabog.pdfIn PDF document text
    • http://sevennews.com.br/ckfinder/userfiles/files/moxijatodarixamadunodunaw.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_off0000b268.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB268 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA7F 10576 bytes
SHA-256: aa986fbcd4c5aadf3b805071bf6fcc5a59b494d26a258cb5ca1530a41f7fd507
font_02_sfnt_off0000e2ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2CE 16292 bytes
SHA-256: 9190e0e68353410326ef56ec70d91db3b16ad0824245e7f7eb5cec252f4bcf53