Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7758b44889a03fd…

MALICIOUS

PDF

85.6 KB Created: 2021-09-20 22:46:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d4180e4ba655ee610fbc94c5ef5585c4 SHA-1: 89310768de416f5919932c8985b79db471888bd3 SHA-256: b7758b44889a03fd23483110f67a133ab87e55578efdb31a1bee016c547ee2fc
66 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to domains that appear to be part of a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior, indicating an attempt to obscure the final destination or distribute malicious links across many domains. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 4

  • 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 http://reedxtrainternational.com/uploads/pages/file/98812507032.pdf In PDF document text
    • https://olterus.com/contents/files/3102288720.pdfIn PDF document text
    • https://thebookonpersonaltransformation.com/FCKeditor/file/gagesigeruradozek.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/161364d69bbc4f---11671757854.pdfIn PDF document text
    • http://creatinglifeoptions.com/userfiles/files/fuwunosuje.pdfIn PDF document text
    • http://yuanjiangchem.com/upload/files/34412664117.pdfIn PDF document text
    • http://namuvaldymas.lt/userfiles/file/lajomifeb.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae38289663---mivenut.pdfIn PDF document text
    • http://studioprogettoarchitettura.eu/userfiles/files/vazesebidorasekudov.pdfIn PDF document text
    • http://j-line.ca/fck_upload/file/rifepubenitu.pdfIn PDF document text
    • http://leasingtowers.com/ckfinder/userfiles/files/42988517786.pdfIn PDF document text
    • https://asfus.net/virgsurv/userfiles/file/44931939563.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/tujafisapixitakid.pdfIn PDF document text
    • http://brilspa.ro/userfiles/file///nivegopefa.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/65197323301.pdfIn PDF document text
    • http://vejwun.cz/images/wopopixilebizawosupaku.pdfIn PDF document text
    • http://hangtatmj.com/userfiles/20830367433.pdfIn PDF document text
    • http://alanaf.ru/userfiles/files/57542109437.pdfIn PDF document text
    • http://back2wood.de/userfiles/file/nuded.pdfIn PDF document text
    • http://fence-alarm.com/userfiles/files/mibejotumebokasobesi.pdfIn PDF document text
    • https://duongthuy.net/userfiles/file/dilufedojigavajogik.pdfIn PDF document text
    • http://xn--80aaffebba2apgigwiiececnggk9e4k.xn--p1ai/pict/file/39296017125.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/fabad.pdfIn PDF document text
    • http://lemonsport.hu/upload/file/24111092562.pdfIn PDF document text
    • https://xn--b8qxb801j.tw/upload/files/65224709206.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=stop+android+app+from+updatingPDF 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_off0000e974.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE974 10668 bytes
SHA-256: f115b23cf249eba07d927cc649e85d9b5a65d8c6bf7f1fe706ce8f252f52634a
font_01_sfnt_off000101ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000119c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119C0 18064 bytes
SHA-256: 87c7cfb9c61441840ac18844edbfd58f9f350249be80f46ac766136c56f00a05

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