Malicious PDF — malware analysis report

Static analysis result for SHA-256 4758c9e96b6e1f2e…

MALICIOUS

PDF

81.6 KB Created: 2021-09-17 04:00:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ffd9a52c44eeea2ac87cbf87e944340c SHA-1: 3deddbba7be873a29a3106fc76324b529dc230f7 SHA-256: 4758c9e96b6e1f2e629f6dc1b893502a77bb8590c1598de38d0b2d16f306a8cb
202 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and multiple external URIs, including one pointing to 'garglob.ru', which is flagged as a link farm. Heuristics indicate the document uses MFA/one-time-code harvesting lures and visual download buttons, suggesting a phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to exploit the user into providing credentials or executing a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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.
  • 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 https://garglob.ru/uplcv?utm_term=free+paysafecard+codes+no+download
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/68186147104.pdf
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16135b05895707---10412614125.pdf
    • https://sdudyogtechnologies.in/ckfinder/userfiles/files/14197540957.pdf
    • https://nhomphuongnam.com/upload/files/kefugowufi.pdf
    • https://happy-playground.gr/uploads/_uploads/files/97051382751.pdf
    • http://soskuwait.com/outscapes/admin/ckeditor/uploads/ck/files/76024960953.pdf
    • http://printific.com/images/contentimages/files/taverutaxinofobata.pdf
    • http://technestudio.eu/userfiles/files/nerikitaxeja.pdf
    • https://girisimhaber.com/uploads/file/mumipubabenogobixini.pdf
    • http://phutungtdc.com/upload/files/fuvuj.pdf
    • https://songhong-thudo.com/img/files/56610061743.pdf
    • http://uklearningnetwork.com/userfiles/file/33684142322.pdf
    • https://rkdestate.com/userfiles/file/5092051042.pdf
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16136b6d38cf35---butupobasoxozisanuwu.pdf
    • https://biserica-izvorul-tamaduirii.ro/files/98607205451.pdf
    • http://majortaylorride.info/images/uploaded/file/gebukejepixawezudir.pdf
    • http://bytip.net/filespath/files/20210914080916.pdf
    • http://erdbau-rauch.at/38822943026.pdf
    • http://iltorg.ru/upload/file/sudejijojabefavapubiw.pdf
    • http://pereplanirovkaoblast.ru/pict/file/8955725205.pdf
    • https://mytalk7.com/_UploadFile/Images/file/54636340288.pdf
    • http://danangsculpture.com/uploads/image/files/39824662476.pdf
    • http://rama-sp.com/rama/webroot/js/ckfinder/userfiles/files/magobijubadametovozow.pdf
    • http://ms-beauty.com/ckfinder/userfiles/files/relizopi.pdf
    • 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_off0000d906.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD906 16792 bytes
font_01_sfnt_off0000f11d.bin
f17336b259117c5d003cd36cf05409e2fd1d34f7d95a140ec138b8328dbfbf9d
pdf-font-stream PDF embedded font (sfnt) at offset 0xF11D 10600 bytes
font_02_sfnt_off0001097f.bin
56c32367f218738bb626a36e60e13eb30a66a73a0fbdc8f5572015813f556833
pdf-font-stream PDF embedded font (sfnt) at offset 0x1097F 18076 bytes