Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b75ab539b2ff80e…

MALICIOUS

PDF

78.3 KB Created: 2021-09-21 06:44:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: afb51682bbebfc1ba8ba9392bbac8a2f SHA-1: 80b272996f9485f67a06e173205b18c19140fb51 SHA-256: 2b75ab539b2ff80e952d92a25ec8ba832380430e62ca0ef8745ecc0588506495
142 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external links, many of which point to disposable domains, indicating a phishing or malware distribution attempt. The presence of a 'download button' heuristic further supports a lure-based attack. ClamAV detection as 'Pdf.Phishing.Trojan' confirms the malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://krisoc.ru/uplcv?utm_term=super+clone+pro+premium+apk PDF link annotation
    • http://onlytech-tunisie.com/userfiles/file/gubowoguxuzipejobokeseren.pdfIn PDF document text
    • http://bentleyplemtech.ru/userfiles/file/xipisu.pdfIn PDF document text
    • http://nail-free.com/ckfinder/userfiles/files/vemogogitonas.pdfIn PDF document text
    • https://theptaynam.vn/upload/files/19713895376.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/edb8dcc6b1d1ec97fd40037901186d40/falib.pdfIn PDF document text
    • http://dynamic1984.com/user_file/file/1366895094.pdfIn PDF document text
    • http://partnercable.com/files/71039206624.pdfIn PDF document text
    • http://zge-led.com/luodan/images/userfiles/file/xurasoxutevifejobidux.pdfIn PDF document text
    • http://dspec-car.com/js/upload/files/budiparimi.pdfIn PDF document text
    • http://thietkewebbacninh.com/webroot/img/files/zobuxuvojemos.pdfIn PDF document text
    • http://33podarka.ru/pictures/files/8784893367.pdfIn PDF document text
    • http://lizhechem.com/upload/files/wisolopa.pdfIn PDF document text
    • http://studiosimonepantaleo.it/userfiles/files/saxuxegalitamiwenut.pdfIn PDF document text
    • http://sapthagireesyathra.com/userfiles/file/nojoraxarigupenedetidad.pdfIn PDF document text
    • http://newbiesites.com/userfiles/file/9281891630.pdfIn PDF document text
    • https://argumentua.com/i/file/misiva.pdfIn PDF document text
    • http://www.bc-arman.kz/ckfinder/userfiles/files/24693066001.pdfIn PDF document text
    • http://anadolumatbaa42.com/genelresimler/file/lasogifufuk.pdfIn PDF document text
    • http://xn--hazrdner-r4a10d.com/alisveris/yollanan_resimler/file/vizagikefofani.pdfIn PDF document text
    • http://naasschoolofmotoring.com/fckeditor/userfiles/file/xixefilemotelegojog.pdfIn PDF document text
    • http://kolesnikov.pro/ckfinder/userfiles/files/58121493305.pdfIn PDF document text
    • http://wawa757.com/uploads/files/vozitugupajemepekunuz.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_off0000d082.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD082 16680 bytes
SHA-256: de732d68b10c3bc60c2485539a7e138b7b30b70536a24f18d9819501f47d61a1
font_01_sfnt_off0000fbb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB3 10536 bytes
SHA-256: f69d3a3245a81efa4aae51cb24743a6ab01c94b5abfd13601bfe8aabccf6749c
font_02_sfnt_off0001139c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1139C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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