Malicious PDF — malware analysis report

Static analysis result for SHA-256 48958b1951f27591…

MALICIOUS

PDF

82.4 KB Created: 2021-09-18 20:29:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bf0940aaddbd9fd2984616ea8659900a SHA-1: 35495d07abba68258188bed9361401c3e0fd6910 SHA-256: 48958b1951f27591e4f6f36cd7f4f26da36338acd815fa21ea25789598a3581d
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. Heuristics indicate it functions as a link farm on disposable hosting and is associated with advance-fee scams. The embedded JavaScript likely serves to redirect the user to malicious sites or download further payloads, contributing to the overall phishing and scamming objective.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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.
  • 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://mywayrtk.info/userfiles/file/6127726536.pdf
    • http://purepassion.pl/userfiles/file/kupajufipuzigemoxaperifa.pdf
    • http://yongqingtech.com/d/files/51988420679.pdf
    • http://katela.net/userData/board/file/60169179622.pdf
    • http://smartdeal.pl/files/upload/files/76330056942.pdf
    • http://fese.in/ienupdimages/images/files/27953523499.pdf
    • http://yakutiaprime.ru/SITE/files/editor/file/liguwifurekunar.pdf
    • https://1tlstar.com/storage/uploads/files/lusunager.pdf
    • https://pilot-nav.com/ckfinder/userfiles/files/4405735068.pdf
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16139d996102b9---50804191068.pdf
    • http://jenan.com/ckfinder/userfiles/files/babikimevapade.pdf
    • https://777mto.info/contents/files/47404520300.pdf
    • https://genegurumiraclehealer.com/userfiles/file/faxudirunozulutekagi.pdf
    • http://toflight.mobi/attachment/ckeditor/files/dd11df34d291e082813cf8a3a6485d19.pdf
    • http://studioguagnoni.it/userfiles/files/dojusiwapunowevebulemer.pdf
    • http://ozt.zielonetarasy-cieplice.pl/uploads/userfiles/files/40945224108.pdf
    • http://quimis.net/js/ckfinder/userfiles/files/73170246841.pdf
    • https://armenia4d.com/contents/files/97307004006.pdf
    • http://monteconsultants.com/image/upload/File/tukulexawos.pdf
    • http://hysansam.com/fckeditor/userfiles/image/60246233800.pdf
    • http://otvorene-srdce.sk/userfiles/file/74048117282.pdf
    • https://veaodaibrahma.com/uploads/image/files/49244461615.pdf
    • http://mestav.sk/uploaded_images/file/dumevasakipatakifaj.pdf
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137e9b4664e9---58914538688.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=board+games+for+android+phone
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc8a.bin
120bb8861f2fdb93f5c2f2274597af7d6d722ba120aa877d6edbd32909b1ff40		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC8A 17916 bytes
font_01_sfnt_off00010b59.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B59 16792 bytes
font_02_sfnt_off00012370.bin
9a860a6c33512fa6f21be02afa17e1763b2f3a80fbc89a3c44d7b3d11e974bbb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12370 10856 bytes

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