Malicious PDF — malware analysis report

Static analysis result for SHA-256 d49c36398661b200…

MALICIOUS

PDF

70.3 KB Created: 2021-09-25 05:32:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e8c0ae4d8e3c563ca149eab333350acb SHA-1: b6b59d1115baefbecc830f39d941c86313ce8827 SHA-256: d49c36398661b200dae9642d28ee20dd09770dbb3eeb40213346b579477ea718
174 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple external links, many of which point to disposable domains and are indicative of a link farm. The heuristic 'PDF_RANDOM_URL_LINK' specifically highlights a link to 'http://veterinarioassociatopacinidallatorre.eu/userfiles/files/mitezexefivolatog.pdf', suggesting an attempt to redirect the user to a malicious resource. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to download and execute a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://trineckevzdelavani.cz/webpagebuilder/ckfinder/userfiles/files/50587302643.pdf In PDF document text
    • http://zxsolar.com/d/files/jituvelipu.pdfIn PDF document text
    • http://www.shjkyq.com/up_files/FCK/file/xaraboberutexivopirixaw.pdfIn PDF document text
    • http://veterinarioassociatopacinidallatorre.eu/userfiles/files/mitezexefivolatog.pdfIn PDF document text
    • http://buddhavihara.net/userfiles/file/xinudurukorapaxunoramif.pdfIn PDF document text
    • http://irpuyesh.com/cache/fck_files/file/35720256182.pdfIn PDF document text
    • https://clove7.com/userfiles/file/68558672382.pdfIn PDF document text
    • http://badaranquehablar.com/userfiles/files/dirorunugagidati.pdfIn PDF document text
    • https://vibingvibes.com/userfiles/files/32450980649.pdfIn PDF document text
    • http://caycanhtuyhien.com/uploads/image/files/fisegasufamezuwenupemal.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/lefup.pdfIn PDF document text
    • http://qqwandai.com/uploadfile/file/84237424777.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee5eaef3e0---52947024182.pdfIn PDF document text
    • http://naphogacomposite.com/upload/files/53080707092.pdfIn PDF document text
    • https://icbacademy.com/upload/files/58054441646.pdfIn PDF document text
    • http://solo-reisen.com/media/images/file/fogaxelafogurival.pdfIn PDF document text
    • https://www.tulsarad.com/my_content/js/ckfinder/userfiles/files/fibexog.pdfIn PDF document text
    • http://prunay-en-yvelines.fr/ckfinder/userfiles/files/93814292640.pdfIn PDF document text
    • https://www.rosebankprimary.co.za/inc/ckfinder/userfiles/files/leloj.pdfIn PDF document text
    • http://parvazyab.net/basefile/api203/files/95056209548.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/71161695280.pdfIn PDF document text
    • http://mobilni-kadernictvi.cz/files/file/3171732614.pdfIn PDF document text
    • http://cbestdesign.com/ckfinder/images_store/files/sililanozojarulu.pdfIn PDF document text
    • http://erisalaw-chicago.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/5463110492.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=watch+jeepers+creepers+1+online+freePDF 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_off0000b3fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3FB 15300 bytes
SHA-256: f12368e2623c28d92258b18b718e1feb000a83639e2924262bd366856bfbea76
font_01_sfnt_off0000dab6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB6 10752 bytes
SHA-256: 68a4d12cb95599e188f05cd445533edb6829a2600134bce7df52a5cfd00b04df
font_02_sfnt_off0000f36b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF36B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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