Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a97f61d58e4179b…

MALICIOUS

PDF

78.3 KB Created: 2021-09-11 04:15:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 99ee8f7ef3a14c85d291f05f10cac7d1 SHA-1: 7eb9f3874eb6146d46c1591c99e0215112625332 SHA-256: 2a97f61d58e4179b3717f166eeedfb215879cf13bbec5610632e634b9fdcb17e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external links, many pointing to disposable domains, suggesting a link farm or phishing lure. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a high number of distinct hosts, reinforcing the phishing and link-farm nature of the document. While no scripts were explicitly extracted, the nature of the PDF and its numerous external links strongly suggest it is used to redirect users to malicious sites, likely for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://dgssu.com/upfolder/e/files/20210909191340.pdf In PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/en1eomop7qf3kmsn9mccvjmbr5/rigivabexivowusorif.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/58404746171.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/iodsa1dj3c4r8qmfr36pfsstfc/28808257877.pdfIn PDF document text
    • http://xaydungphongphu.com/uploads/files/rimonapusuxalexo.pdfIn PDF document text
    • http://valeneighbors.com/userimages/xuvizidozoxofex.pdfIn PDF document text
    • http://qlionshousing.ca/userfiles/file/84360515573.pdfIn PDF document text
    • https://pellevah.com/upload/files/tubarifixakijosonor.pdfIn PDF document text
    • http://eros-arena.name/eros/userfiles/file/63190275421.pdfIn PDF document text
    • https://immsac.pe/sgi_userfiles/userfiles/files/34062351537.pdfIn PDF document text
    • http://gonvvama.net/filespath/files/20210911024755.pdfIn PDF document text
    • https://digireg.dk/upload/tiwuwofexatuf.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/woxunekepupozijunabokajog.pdfIn PDF document text
    • http://michaelwilliamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gudasezelumijefebeninugad.pdfIn PDF document text
    • https://www.nstoplana.rs/ckfinder/userfiles/files/74289597694.pdfIn PDF document text
    • https://ijtm.in/userfiles/file/98776353147.pdfIn PDF document text
    • http://www.gc-antey.ru/ckfinder/userfiles/files/figugapotilulesepafiwapa.pdfIn PDF document text
    • http://shiokuda1.com/contents/files/96270143009.pdfIn PDF document text
    • http://rulife.ru/ckfinder/userfiles/files/nodubi.pdfIn PDF document text
    • http://liburnia.pl/userfiles/file/vaduwogam.pdfIn PDF document text
    • http://talani.nl/userfiles/image/file/71477431398.pdfIn PDF document text
    • http://9jamail.com/FCKeditor/editor/filemanager/connectors/userfiles/file/fukibofewixi.pdfIn PDF document text
    • https://cottonweb.net/userfiles/file/laberavesatove.pdfIn PDF document text
    • https://faguaflowers.com/images/admin/file/3090637026.pdfIn PDF document text
    • https://corianderedmonton.com/ckfinder/userfiles/files/ruxevufopojutofuwowot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=daniel+h+pink+drive+pdfPDF 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_off0000cfd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFD8 17292 bytes
SHA-256: 183351b16779cfe4c64b4fc77118700e77fef3124ca50e51c72e789a371c52eb
font_01_sfnt_off0000fc61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC61 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011478.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11478 10368 bytes
SHA-256: 270aeba9ac9db7810c3160efeb05e527b242fed5edc8659746574883d07194e0