Malicious PDF — malware analysis report

Static analysis result for SHA-256 da0838006c7f059d…

MALICIOUS

PDF

71.5 KB Created: 2021-09-25 22:36:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: fcb52b0e64999626782257a312eec20c SHA-1: 19d984bbd7b34adfbd0265f5dc1960bd2df4413e SHA-256: da0838006c7f059d17f7958ba09a89027a25ed68c82bf3df146230f019059ef2
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to suspicious domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high volume of links on disposable hosting, suggesting a tactic to obscure malicious destinations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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.
  • 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://wrd13.com/force/file/mugeguvifiju.pdf In PDF document text
    • http://yds-wcv.jp/free_images/files/46922763158.pdfIn PDF document text
    • http://floridadressyourhome.com/uploaded_files/userfiles/files/bowuzeriwexapokaw.pdfIn PDF document text
    • https://arabadvertise.com/userfiles/files/pejorijivozatikigisux.pdfIn PDF document text
    • https://tranthachcaodanang.com/uploads/image/files/6329343272.pdfIn PDF document text
    • https://aashianarealty.com/file/85715445882.pdfIn PDF document text
    • https://allmassage.net/upload/file/20210921222557.pdfIn PDF document text
    • https://jvlegacyhomerepairsmd.com/nbloom/fckuploads/file/69857781921.pdfIn PDF document text
    • http://hanilkwanla.com/uploads/files/94357611269.pdfIn PDF document text
    • http://skazka76.ru/pic/userfile/rasoma.pdfIn PDF document text
    • http://gptools.net/userfiles/file/doxanosigeb.pdfIn PDF document text
    • http://chapaconoticias.com/assets/ckfinder/core/connector/php/uploads/files/75979179893.pdfIn PDF document text
    • http://musclecar-taps.com/js/upload/files/45054552139.pdfIn PDF document text
    • https://4cmedica.com/ficheiros_upload/file/sisejukavudapodoregulexa.pdfIn PDF document text
    • http://f-okinawa.com/img/tmp/files/23818551048.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/e5fb701d5c5b34dbae962bfa522e1ef8/wuwigusitabu.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/822bdf266d389e269a73c5c58eb8f516/zaxatafipi.pdfIn PDF document text
    • https://servauto.fr/img/user/file/58566461420.pdfIn PDF document text
    • http://bakefruit.com/uploads/files/202109080021273866.pdfIn PDF document text
    • https://mpressivelabels.com.au/application/third_party/ckfinder/userfiles/files/64865077387.pdfIn PDF document text
    • http://immopolignano.lu/images/lemisexabexiketefimos.pdfIn PDF document text
    • http://opuspointpartners.com/ckfinder/userfiles/files/lilaf.pdfIn PDF document text
    • http://mrs724.ir/basefile/drtiketcom/files/jixemuro.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=hdfriday+online+web+seriesPDF 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_off0000b32a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB32A 16824 bytes
SHA-256: 1f93aaf9aa696633b1172d1f68b0600baccb675972ae3f15af2f1cbadea93367
font_01_sfnt_off0000de5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE5F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f676.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF676 10580 bytes
SHA-256: 96d41c146089cd5be8dd447eac95e44f33b4c42ecf3168d7d6c6929a78ae10d1

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