Malicious PDF — malware analysis report

Static analysis result for SHA-256 96f58850d9af4906…

MALICIOUS

PDF

81.1 KB Created: 2021-09-23 16:08:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b77b0f6e217effed91884c6fcb7d959c SHA-1: 2db8e8d0d2a7fd08fa0cbafab7553f88ef428ab0 SHA-256: 96f58850d9af49069c9f6fc981785f939257701dc48e3b382b583dec07229239
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document contains numerous embedded URLs, many of which point to potentially malicious domains, and one heuristic specifically identified it as a link farm designed for SEO manipulation. Although no scripts were directly extracted, the presence of numerous external links and the overall structure suggest an attempt to redirect users to malicious content or facilitate further downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://salocchi.it/userfiles/files/zufukinetixewijuparaleme.pdf
    • https://jmclimatizacionhvac.cl/images/subidas/file/pipowefemodipoteke.pdf
    • https://www.aledrukujemy.pl/ckfinder/userfiles/files/69125837999.pdf
    • http://cellesekorea.com/ckupload/files/safora.pdf
    • http://cabini.it/userfiles/files/57118610588.pdf
    • http://indago-rovigo.it/userfiles/files/47124614404.pdf
    • https://devcons.org/uploads/userfiles/files/52784233881.pdf
    • https://www.shropshirefurniture.co.uk/admin/ckfinder/userfiles/files/mexetaxik.pdf
    • http://snft.ro/media/file/zarawipukujomedeloneje.pdf
    • http://debandhelder.nl/ckfinder/userfiles/files/11877450198.pdf
    • https://grdr.org/paidel/ckfinder/userfiles/files/kavaraverunorule.pdf
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/p3luj033q6933ke9qvu4ed1mjq/welatup.pdf
    • http://syuncyoku.jp/upload/file/gisoranojuxudakutetexedi.pdf
    • http://noithatachau.vn/webroot/img/files/vizujelak.pdf
    • https://kratky.eu/files/file/18588400799.pdf
    • http://abwmountvernon.com/uploads/files/16967442014.pdf
    • https://calendarsunrooms.com/userfiles/files/71268631299.pdf
    • https://myphambambi.com/webroot/img/files/82145610040.pdf
    • http://bordahusfeldolgozo.hu/editor_up/xozelaterisomezowu.pdf
    • http://quesnelfoundation.ca/userfiles/file/xokuvidajurekemajakolova.pdf
    • https://ecoverservice.be/gallery/file/ponugivul.pdf
    • http://yasaitogo.com/uploads/files/64402023915.pdf
    • http://bridgeonlaw.com/filespath/files/20210907084855.pdf
    • http://connect-event.fr/ckfinder/userfiles/files/mowasaxumojun.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+root+mi+phone+with+pc
    • 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_off0000da19.bin
44cc22da643f77c00e9617f5edcda1cb64ec84aa69341d4940b17b6ce0bebc1a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA19 10340 bytes
font_01_sfnt_off0000f13a.bin
baca08912e62d95f725cbf2aa24b3a9355fba87a05a3868786a88d3c736cbf4b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF13A 17620 bytes
font_02_sfnt_off00011e8e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11E8E 16792 bytes

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