Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2cb7bbabc4ec06d…

MALICIOUS

PDF

87.6 KB Created: 2021-09-18 08:50:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b67a8849e3e37ae9562bacffee14ba04 SHA-1: eb7d53109379048e84fef0a27744ced06e9efe83 SHA-256: a2cb7bbabc4ec06ddb7d518127b2e11aaf1305801a16de0e65807737465b1829
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious. It contains numerous embedded URLs, many of which point to disposable domains and are likely used for phishing or to redirect to malicious content. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to obscure the final malicious destination.

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://vatlieutaphu.com/upload/files/madipore.pdf In PDF document text
    • http://chizclean.ru/files/fck/file/berituzo.pdfIn PDF document text
    • http://www.cddfct.com/up_files/file/tidibarurizopazi.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/9bslfahq61db8dcb580faih6hr/xafuxukidunoside.pdfIn PDF document text
    • https://drivetripper.com/userfiles2020/files/85897467606.pdfIn PDF document text
    • http://jiab.net/userData/board/file/24098503526.pdfIn PDF document text
    • http://shiraz.sk/ckfinder/userfiles/files/4727554825.pdfIn PDF document text
    • https://leifs-auto.dk/images/file/sixilumunuzogulidimuga.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/20210909/210909061723034227a6w7bc7sykdb.pdfIn PDF document text
    • http://www.pes.edu.mn/ckfinder/userfiles/files/vivutunijasugupex.pdfIn PDF document text
    • http://goddesshair.net/upload/users/files/fozaku.pdfIn PDF document text
    • http://j-club.eu/userfiles/file/58602150461.pdfIn PDF document text
    • http://candleelectricals.com/uploaded_files/userfiles/files/wobivawogexuzix.pdfIn PDF document text
    • http://gd-weimi.com/upfolder/e/files/20210906021153.pdfIn PDF document text
    • http://zhongguohuachun.com/d/files/terepo.pdfIn PDF document text
    • http://crestviewshopping.abwingsmd.com/uploads/files/finoxazazorasosipawaped.pdfIn PDF document text
    • https://pmeds.us/userfiles/file/midugajokezivule.pdfIn PDF document text
    • https://5of7edwardstreet.com/assets/media/files/dodekefujidozawasugab.pdfIn PDF document text
    • http://pasaru.com/upload/files/miwajelodekuvakepebedej.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613b4a12e2313---nabiwixanuzeloj.pdfIn PDF document text
    • http://phelieuviethung.vn/upload/files/33173827371.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/bolikuv.pdfIn PDF document text
    • http://sudeoksa.net/userfiles/file/20210914160139.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=facetime+for+android+phones+verizonPDF 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_off0000f0ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0CE 10940 bytes
SHA-256: 24df5868c6a1fad43b98384c5f9e5689ddd2b10b469cb07756103284de8de9ca
font_01_sfnt_off00010a06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A06 17728 bytes
SHA-256: 23b85e3efb2bac496316d52a1dc51c21c70f2a02334055d44efac53a5b91fc7a
font_02_sfnt_off00013869.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13869 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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