Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7a6c58aeab45b22…

MALICIOUS

PDF

85.5 KB Created: 2021-10-07 04:13:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 34db06b7046d211cf2df9d20fbc03ab9 SHA-1: aea6e7a93789f076c7f86fa7cf3fcdbb1c10a919 SHA-256: b7a6c58aeab45b22eadf27ce11b4b7b1b7bce34bb14fca62f2363a4aa8b27620
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many of which point to disposable or unknown hosting, and is identified as a link farm. The presence of these links suggests an attempt to redirect users to malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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 http://chiesamadremarsala.eu/userfiles/files/69826679062.pdf In PDF document text
    • http://safiorida.nl/operatori/userfiles/file/79273047010.pdfIn PDF document text
    • http://joy05.com/_UploadFile/Images/file/fidokuziw.pdfIn PDF document text
    • http://mannadey.in/FCKeditor/file/dowuvidijajexipimu.pdfIn PDF document text
    • https://hefcom-hydraulics.com/ckfinder/userfiles/files/samupotopo.pdfIn PDF document text
    • http://avtokapriz42.ru/userfiles/file/domibogi.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/dc28e019bac4f977e0a614ad2a817ac0/50553252708.pdfIn PDF document text
    • http://voyagerav.com/v15/Upload/file/2021928165044011.pdfIn PDF document text
    • http://homeopathyhongkong.cn/files/81124659372.pdfIn PDF document text
    • http://tbeaindia.com/userfiles/file/94867978191.pdfIn PDF document text
    • https://km2804.com/ckupload/files/61309509300.pdfIn PDF document text
    • https://techson-cctv.com/upload/file/81868420724.pdfIn PDF document text
    • http://sweepinstyle.com/userfiles/file/dugadopas.pdfIn PDF document text
    • http://formacio.fic.cat/uploads/file/36792407139.pdfIn PDF document text
    • http://www.oteliapelsin.ru/ckfinder/userfiles/files/kuwewigilarofolafi.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/mowegefupetuxij.pdfIn PDF document text
    • http://meimagedance.tw/ufiles/files/98851960444.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/dm6hbvo6q47vmo80q10tls9iq2/48019590262.pdfIn PDF document text
    • http://galaxyjewel.cn/uploadfile/files/73987506357.pdfIn PDF document text
    • http://blekinge.boj.se/uploads/userfiles/files/2062044562.pdfIn PDF document text
    • http://edituj.cz/res/file/78605986268.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=minecraft+how+to+get+iron+orePDF 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_off0000e240.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE240 20808 bytes
SHA-256: 188f0cd6b640db76e21fc6bc2bea23ce5d46b04814cec80db14f1e6eedcd9bba
font_01_sfnt_off000118fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013115.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13115 10480 bytes
SHA-256: e5fbeeb4bce7d0886dd3a3a2bc015cf04c99fcbd7e5ded0305e77c5bfb0cdc09

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