Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd1383a85adb58e9…

MALICIOUS

PDF

85.9 KB Created: 2021-09-17 23:14:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 50136595cf1af2398dfe6a6f07e4ccf2 SHA-1: 1e696137fe473661cf7b061ac695e5be42e03ea3 SHA-256: cd1383a85adb58e9e8d0cda96bc5eb31f5329f49fb46f8d53920b2aeae9e278a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML classifiers and ClamAV as malicious, indicating a high probability of malicious intent. The PDF contains numerous embedded URLs, many of which point to unknown or potentially malicious domains, suggesting it functions as a link farm or phishing lure. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this assessment, indicating a tactic to distribute links across many disposable hosts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://faurau.com/luodan/images/userfiles/file/famapemobakelaxe.pdf In PDF document text
    • http://scpt.it/userfiles/files/gisukusega.pdfIn PDF document text
    • http://psn-monolit.ru/img_file/files/nudodareg.pdfIn PDF document text
    • https://vanphongphampmc.com/upload/files/71073625081.pdfIn PDF document text
    • http://eurolocal.info/sites/default/files/images/file/57893612710.pdfIn PDF document text
    • https://la-klamm.org/userfiles/file/38344157172.pdfIn PDF document text
    • https://primer-spb.ru/files/files/55167219248.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/48936833947.pdfIn PDF document text
    • http://afro-safari.com/upload/files/28326328252.pdfIn PDF document text
    • https://pasarangroup2.com/contents/files/zusigoxupejoze.pdfIn PDF document text
    • http://bygreenpure.com/userfiles/file/kodejawomogemekapokom.pdfIn PDF document text
    • https://markapin.com/calisma2/files/uploads/meguziba.pdfIn PDF document text
    • https://fullgame.hu/uploads/files/7544317229.pdfIn PDF document text
    • http://graciaindoutama.com/kingkong/userfiles/files/barorolomaduki.pdfIn PDF document text
    • http://commissioncollectionlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/81489615273.pdfIn PDF document text
    • http://bsl-trans.ru/admin/ckfinder/userfiles/files/jomatipakugon.pdfIn PDF document text
    • https://deshpanday.com/ckfinder/userfiles/files/12204356258.pdfIn PDF document text
    • http://sipzip.com/userfiles/file/88162774861.pdfIn PDF document text
    • http://cukorbetegshop.hu/files/nitibenep.pdfIn PDF document text
    • http://forti.in/userfiles/file/binoguxuvinufama.pdfIn PDF document text
    • https://tideandtigers.com/ckfinder/userfiles/files/negowowadobimanizev.pdfIn PDF document text
    • http://vipforiraq.com/userfiles/files/pupegadibidogenudopok.pdfIn PDF document text
    • http://www.civilhospitalpalampur.in/img/uploads/files/lumagijima.pdfIn PDF document text
    • http://vijyaiprismcrm.com/userfiles/files/botulezibikok.pdfIn PDF document text
    • https://eijo.in/ckfinder/userfiles/files/bixigelalatamivima.pdfIn PDF document text
    • https://fgcrubochi.com.ng/ckfinder/userfiles/files/30718567306.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=turn+off+phone+lock+androidPDF 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_off0000eb7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB7D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010394.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10394 10604 bytes
SHA-256: 7c56c3a1099a9fb0e6ffcb3da808e98c93b9d435d116200575d85c8a844acd88
font_02_sfnt_off00011ba3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BA3 17620 bytes
SHA-256: d038331d9a408a53bba91df40c83c324c0c0c20ffefc7c53eb95338ae8eba0ab