Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8a2417c03aece3f…

MALICIOUS

PDF

82.8 KB Created: 2021-09-18 07:17:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: df4cc78894fe9f4589e0c9b1ad75923f SHA-1: d0a5307ae14beaaf9c8eccd6de3f37fa2b29cd5d SHA-256: a8a2417c03aece3fd50e0bb96590048f95dcbf903ba0baca6e55a63f59bccd60
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass gateway security. Numerous embedded URLs point to potential download locations for this secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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 https://gtnet-engine.com/ckfinder/userfiles/files/dizixula.pdf In PDF document text
    • http://nakajima-ya.com/upload/save_image/files/nujufabedanesiw.pdfIn PDF document text
    • https://dreptultau.hotnews.md/upload/userfiles/files/kukolibetadiriwefu.pdfIn PDF document text
    • http://mondoacquapiscine.com/userfiles/files/zunaxijorogitimekulajusur.pdfIn PDF document text
    • https://siam-royal-view.ru/data/files/38061642161.pdfIn PDF document text
    • http://dataction.org/demo/dataction/media/sipepubugewi.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/16138981276018---nezav.pdfIn PDF document text
    • http://avs-market.ru/admin/ckfinder/userfiles/files/gifuzujaw.pdfIn PDF document text
    • https://10s317.com/uploads/files/202109041203229976.pdfIn PDF document text
    • https://tessuno.com/upload/files/61450dbea5cd5.pdfIn PDF document text
    • https://mandarinkinesiska.com/userfiles/file/25248529759.pdfIn PDF document text
    • http://qhchemicalsfeed.com/upload/files/foronomezevogifegipug.pdfIn PDF document text
    • http://vocal.bpv.su/content/files/files/97481135190.pdfIn PDF document text
    • http://liubeauty.com/luutru/files/xadazef.pdfIn PDF document text
    • https://yam-token.com/business_school/uploads/file/67755154688.pdfIn PDF document text
    • http://www.kymkarajok.net/tiedostot/files/78808802863.pdfIn PDF document text
    • http://www.ecrivains-consult.fr/easyonline/ckfinder/userfiles/files/43761992201.pdfIn PDF document text
    • http://cataga.de/beta/files/file/95223832690.pdfIn PDF document text
    • https://giverny-bkk.com/upload/files/90825694970.pdfIn PDF document text
    • http://tzsunup.com/upload/mikel.pdfIn PDF document text
    • http://123flower.doweb.kr/upload/files/33049963985.pdfIn PDF document text
    • http://hillsdalehorseboarding.com/ckfinder/userfiles/files/vusuwimiligiwerudidivi.pdfIn PDF document text
    • http://gioithieu.btccorp.vn/uploads/files/79201118988.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=beautiful+pattern+lockPDF 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_off0000de9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE9A 10552 bytes
SHA-256: b89fecaf8497f7408fa4461bb7549382196b3fe17db5014b156e433932c785f3
font_01_sfnt_off0000f6c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C2 17936 bytes
SHA-256: dc98220a62960a6ab677e6fbd19729e98d2737c3b40b54819a8a4e131e0caa85
font_02_sfnt_off00012588.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12588 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1