Malicious PDF — malware analysis report

Static analysis result for SHA-256 97f1142f9539de1d…

MALICIOUS

PDF

88.8 KB Created: 2021-09-12 06:45:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 634cea38ed59399534f403d68dc4d5ea SHA-1: 3d9c4aff6e6ffd292be8de9e1ef564a78b20ecc0 SHA-256: 97f1142f9539de1d89c050c0db85372cb4d8ea5f544d19e25b22d2a49e0fa97c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many of which point to suspicious domains and are likely used to redirect users to malicious sites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm on disposable hosting, suggesting a phishing or spamming operation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 https://shriayurvednagpur.org/public/ckfinder/userfiles/files/4186492863.pdf In PDF document text
    • http://makesomenoise.hu/upload/file/40881688295.pdfIn PDF document text
    • http://3e3i.com/UserFiles/file///64315928394.pdfIn PDF document text
    • https://cardion.dk/gfx/fckimages/file/bewolijit.pdfIn PDF document text
    • https://tranhdaquyhn.com/uploads/news_file/61241230981.pdfIn PDF document text
    • https://edenestates.com/ckfinder/userfiles/files/bivoxejakinokawimobon.pdfIn PDF document text
    • https://happycondo.leaddeehub.com/userfiles/files/74880006983.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/qnsf3fflo68vu29q97uhnnpsg5/jobowowerufumelopujizekod.pdfIn PDF document text
    • https://laughteronlineuniversity.com/images/upload/files/34006619436.pdfIn PDF document text
    • http://polipadel.com/userfiles/file/7249362188.pdfIn PDF document text
    • https://itscebu.com/upload/file/20210909033401.pdfIn PDF document text
    • http://coyada.com/up_images/up_images/78104848327.pdfIn PDF document text
    • http://onthebroadway.com/CPD/adminpanel/upload/file/96464897434.pdfIn PDF document text
    • https://kcss.hu/korosi/userfiles/file/67077958588.pdfIn PDF document text
    • https://factorysales.com/userfiles/files/12799217636.pdfIn PDF document text
    • http://shiokuda1.com/contents/files/82850548879.pdfIn PDF document text
    • http://hindustanadvancedsolution.com/t/tutorfirm/uploads/ck/files/33641560405.pdfIn PDF document text
    • http://gzbaosui.com/uploadfile/files/zilanovogupakafi.pdfIn PDF document text
    • http://gachtrangtritranvinhtin.com/gachtrangtritranvinhtin/Images_upload/files/90263300560.pdfIn PDF document text
    • http://fge-service.com/userfiles/file/97552551157.pdfIn PDF document text
    • http://limuzine.md/userfiles/file/88084211993.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613942154c21b---vipokulekirunavete.pdfIn PDF document text
    • http://www.pvvc.cz/files/kolisuvalanizugisejavuv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=quadratic+and+cubic+graphsPDF 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_off0000f2fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2FB 19120 bytes
SHA-256: 2c51d6a13e7695ca7955619dd2c80d9856efc27553fcd569de22b14705f9f8a1
font_01_sfnt_off00012518.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12518 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013d2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D2F 10796 bytes
SHA-256: 866ae0022d03d3a83d111822a27cc42eb1e40401f8ff181e12c639524b33209c

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