PDF malware analysis — malicious · 2955d809df699f8d

MALICIOUS

PDF

68.9 KB Created: 2021-09-17 10:59:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: a01152a35048633ed55f4bfedd3d78a2 SHA-1: da1941c45a30224f3eb65ac3b438fd188f3093c9 SHA-256: 2955d809df699f8de607a15975da10802304cd7e4035e2043e3ca1cc67a00934

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating it is designed to redirect users to potentially malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of embedded JS points to T1059.007, and the overall nature of the document suggests it was delivered as a spearphishing attachment (T1566.001).

Machine Learning

Nyx PDF Classifier malicious score 0.9947

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://krisoc.ru/uplcv?utm_term=copy+files+from+android+to+pc+wireless PDF link annotation
- https://10fci.org/userfiles/file/58651935036.pdfIn PDF document text
- http://keletunderground.hu/images/uploaded_pics/file/jidili.pdfIn PDF document text
- http://magendans.com/imagefiles/file/nomofusipar.pdfIn PDF document text
- http://strandedtattoo.com/file/bokazelesobivigasug.pdfIn PDF document text
- http://algarestofos.pnh.pt/js/ckfinder/userfiles/files/bexejovuwujikenapipov.pdfIn PDF document text
- https://profipreklady.cz/www/ckfinder/userfiles/files/53929463448.pdfIn PDF document text
- http://euromarkcreations.com/new/fck_img/file/negogonotafevitagujow.pdfIn PDF document text
- https://hoangvan.vn/wp-content/uploads/files/najamoludopimero.pdfIn PDF document text
- http://itagqatar.zajeltel.com/itag/file/files/86516680864.pdfIn PDF document text
- http://hongdacable.com/d/files/41497792823.pdfIn PDF document text
- https://damsindia.org/admin/uploads/file/daxafupisumixuxe.pdfIn PDF document text
- http://tbeaindia.com/userfiles/file/fulavamuduwojonuxabixomu.pdfIn PDF document text
- http://24cvety.ru/upload/files/zujozifaw.pdfIn PDF document text
- http://chiari-web.com/ckfinder/optimist/files/ragatuposufew.pdfIn PDF document text
- http://inimtrento.it/userfiles/files/74731844813.pdfIn PDF document text
- http://rosniyom.com/userfiles/files/roketapajegazabaz.pdfIn PDF document text
- http://sprostredkovanieuverov.sk/res/file/vobimimonilopul.pdfIn PDF document text
- http://xn--b1adbbbaeqjtsflbfms0e.xn--p1ai/pict/file/sikewowati.pdfIn PDF document text
- https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142be4783bf0---ketatutaxerikimemexis.pdfIn PDF document text
- http://recrute.fr/files/files/95106948326.pdfIn PDF document text
- http://alothongtin.com/upload/FCK/file/67686107278.pdfIn PDF document text
- http://vinczeandlaszlo.com/upload/sulakit.pdfIn PDF document text
- https://ssmavidiyar.com/public/content-images/files/fujagubuxinimar.pdfIn PDF document text
- http://impactpluslearning.com/ckfinder/userfiles/files/57043011191.pdfIn PDF document text
- http://yey.uw52.com/upload/files/fozelijerijutotakapuse.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_off0000afdf.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xAFDF	11012 bytes
SHA-256: `56b1852d710be7e362a149fe7e68627ac942fab57538a3e2151e4253dadc2ccb`
`font_01_sfnt_off0000c98c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC98C	14536 bytes
SHA-256: `fd1dd2fe707da8866977935cd6064cde2d3cd161c03aaa1523571c355e893f8a`
`font_02_sfnt_off0000edd4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEDD4	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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