PDF malware analysis — malicious · 0b99fd88fa2a95c0

MALICIOUS

PDF

79.8 KB Created: 2021-09-17 03:10:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: c72ddbe320d67856758e7aa2e01294a9 SHA-1: db9cac8c67758fb0038657fb6a6f62ff411540d5 SHA-256: 0b99fd88fa2a95c06d0c43c835b86de3ce5914836d59a6084ec1b75578244e87

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. The presence of embedded JavaScript and a large number of external URIs, many of which are on disposable domains, suggests this PDF is designed to lure users to malicious sites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a link farm strategy on potentially compromised or disposable hosting.

Machine Learning

Nyx PDF Classifier malicious score 0.9949

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://oniceh.ru/uplcv?utm_term=android+bluetooth+auto+connect PDF link annotation
- http://gardens-spa.com/user_pict/file/sebikatoli.pdfIn PDF document text
- http://minhledtran.com/luutru/files/46486628570.pdfIn PDF document text
- http://lamarchesainterita.be/lamarchesainterita/imgdb/news/files/67542689017.pdfIn PDF document text
- http://krukewittfarms.com/userfiles/file/fimaxaras.pdfIn PDF document text
- http://tatagz.com/uploadfile/files/42243309494.pdfIn PDF document text
- https://jkmart.net/FCKFiles/File/85469854782.pdfIn PDF document text
- https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/52c5f02a1b7eade9c08ad06f0318ff62/demogenit.pdfIn PDF document text
- https://tasleemdubai.com/userfiles/files/foduwuvali.pdfIn PDF document text
- http://gdfsztal.com/uploadfile/files/domejofunezu.pdfIn PDF document text
- https://www.kuwaitpolyurethane.com/ckfinder/userfiles/files/bemadisezajonaduwap.pdfIn PDF document text
- https://narellesastro.com/userfiles/files/35549477537.pdfIn PDF document text
- https://xn--90aweabvm.xn--p1ai/ckfinder/userfiles/files/63399390313.pdfIn PDF document text
- http://restavratorstvo.com/ckfinder/userfiles/files/38754671855.pdfIn PDF document text
- http://luxe-pools.fr/i/File/tuzozos.pdfIn PDF document text
- https://somogyplusz.hu/files/69837696546.pdfIn PDF document text
- http://kochamsushi.pl/UserFiles/file/29544310895.pdfIn PDF document text
- https://billard-hauri.ch/userfiles/file/32376096612.pdfIn PDF document text
- https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613bbfb22399f---worixegobajezenam.pdfIn PDF document text
- http://playonathletics.com/userfiles/file/15802160925.pdfIn PDF document text
- https://pernambucoimortal.com/imagens/files/ketune.pdfIn PDF document text
- http://pinturasoltra.com/images/slider/files/sopirifakevaziwodit.pdfIn PDF document text
- http://www.aaar.cat/assets/js/ckfinder/userfiles/files/68831027191.pdfIn PDF document text
- https://biodez.lt/i/File/92143025740.pdfIn PDF document text
- http://profstil.az/userfiles/file/92207663878.pdfIn PDF document text
- http://phannhan.vn/files/usersfiles/files/koxidojimivinagikere.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_off0000d21c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD21C	18420 bytes
SHA-256: `bae1e318ba035fd2e7b7ebd674c543f8661a2af900269af36e18d2c5999dc75a`
`font_01_sfnt_off000101f0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x101F0	10520 bytes
SHA-256: `90d86dcea1773c8568c5d5353d4c0aac5256cae6947170a53bb1295f8b3f248f`
`font_02_sfnt_off000119ca.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x119CA	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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