PDF malware analysis — malicious · 397841680d1c472b

MALICIOUS

PDF

85.5 KB Created: 2021-09-22 15:03:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27

MD5: 940ac0f6ea7301e433515d2cb165fd00 SHA-1: 40a1a4d10218b19a5663da64851c989417239696 SHA-256: 397841680d1c472b93f67d746f808ab9c6a3fff80015119bee1e26a7e53e6934

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, suggesting it is designed to redirect users to potentially harmful websites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a link farm on disposable hosting, commonly used for phishing or distributing further malware.

Machine Learning

Nyx PDF Classifier malicious score 0.9974

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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.
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.
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://crewmak.ru/uplcv?utm_term=fast+and+furious+2+full+movie+123movies PDF link annotation
- https://pointswestliving.com/ckfinder/userfiles/files/21856625997.pdfIn PDF document text
- http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613003102b747---831632397.pdfIn PDF document text
- http://manu-transport.com/documents/file/vajubedegiwivodesegul.pdfIn PDF document text
- https://highendteen.com/userfiles/files/voverozarewin.pdfIn PDF document text
- http://aaas.handyfriendship.com/upload/files/93686829182.pdfIn PDF document text
- http://jingmingtai.com/filespath/files/20210917185453.pdfIn PDF document text
- http://akinmedikal.com/uploads/file/ludinamikaxukibaxizisila.pdfIn PDF document text
- https://budgetparking.ca/admin/uploads/file/taliruduxejukug.pdfIn PDF document text
- https://smshealthcareservices.com/ckfinder/userfiles/files/2996294980.pdfIn PDF document text
- https://thefertilizerproductionline.com/d/files/94954214071.pdfIn PDF document text
- http://arkystudio.eu/userfiles/files/punobomoxa.pdfIn PDF document text
- https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/447d457cba2f97def419fdd356b248e8/gisabazijekuzopa.pdfIn PDF document text
- http://hcm-invoice.vn/hinhanh_fckeditor/file/giwesimatudekerigok.pdfIn PDF document text
- https://bhiringisamsankalimandir.org/userfiles/file/fakotapupezizevoboti.pdfIn PDF document text
- https://rachelrom.com/rescontent/file/gomebi.pdfIn PDF document text
- http://bibliotekaszamocin.pl/img/upload/files/pawegelirolotuditojus.pdfIn PDF document text
- http://asia-test.informacittadino.net/media/files/87149211213.pdfIn PDF document text
- http://www.cenlaenvironmental.com/siteuploads/editorimg/file/bavuso.pdfIn PDF document text
- http://scarpatti.com/files/ketorodexakasani.pdfIn PDF document text
- http://portofmiamitunnel.com/system/js/back/ckfinder/userfiles/files/wutixivugadizereg.pdfIn PDF document text
- https://sapporopools.com/contents/files/vuduzanonemajene.pdfIn PDF document text
- https://olboihorgaszto.hu/editor_up2/bokiwatizudawibusij.pdfIn PDF document text
- http://scard.vn/app/webroot/uploads/files/22645820303.pdfIn PDF document text
- http://drironcat.com/images/file/rivotonev.pdfIn PDF document text
- 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.

Filename	Kind	Source	Size
`font_00_sfnt_off0000e824.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE824	17824 bytes
SHA-256: `aeefb3ff91fa1f140441eb07e461e2d840775c1f319568510ec7b613f65138e6`
`font_01_sfnt_off00011669.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11669	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00012e80.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12E80	11004 bytes
SHA-256: `34fb8236513b58e2f5c2b2e018b09151703b0835b29f9a821153cce235243246`

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