PDF malware analysis — malicious · bdd661bdb1df09f7

MALICIOUS

PDF

72.5 KB Created: 2021-09-21 00:58:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21

MD5: 59a54f7b479f5c7d5dd1f2f91006f32d SHA-1: 37090c92b1dca78b0e7a6b6572c4c45d6404cb90 SHA-256: bdd661bdb1df09f7c2055ce4a055a5a201de4a1facbb75576eebdec01c4a88ab

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains an embedded JavaScript stream and numerous external URIs, indicating a malicious intent to redirect users to potentially harmful websites. The ML classifier and ClamAV detection strongly support this assessment, flagging it as a phishing or trojan threat. The document's structure as a link farm on disposable hosting further reinforces its role in distributing malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9909

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.
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://philabc.ru/uplcv?utm_term=set+up+conference+call+android PDF link annotation
- https://lixtech.com.tw/ckfinder/ckfiles/files/fowemaxidixedojanok.pdfIn PDF document text
- http://xn--80aafbjcazdrhzgiddbbcsg4l.xn--p1ai/pict/file/velawisemomesemafijafipu.pdfIn PDF document text
- http://gostinica-domodedovo.ru/files/39573291469.pdfIn PDF document text
- http://denkobarbell.com/_upload/files/jererodupakakotazufu.pdfIn PDF document text
- https://komunalno-vrgorac.hr/files/95167410563.pdfIn PDF document text
- http://madmojo.com/fckupload/file/55475228341.pdfIn PDF document text
- https://dehaventransportation.com/home/de/public_html/ckfinder/userfiles/files/bofimakedetexifogu.pdfIn PDF document text
- http://mmbassisiprovince.in/files/js/ckfinder/userfiles/files/pogejipobuz.pdfIn PDF document text
- https://www.lipca.com/ckfinder/userfiles/files/fidatup.pdfIn PDF document text
- https://www.tocbirsen.org.tr/ckfinder/userfiles/files/50064979719.pdfIn PDF document text
- https://burgaseguros.com/userfiles/file/tenesebupixunasavusu.pdfIn PDF document text
- https://lmbri.com/WYSIWYGImage/file/20993224838.pdfIn PDF document text
- https://diphong.com/uploads/19534436828.pdfIn PDF document text
- http://slbreakingnews.com/ckfinder/userfiles/files/2344842856.pdfIn PDF document text
- http://wahluenfty.com/userfiles/navebokipozige.pdfIn PDF document text
- https://dodomacnosti.net/data/file/99938673233.pdfIn PDF document text
- http://ganteltechnology.com/system/userfiles/file/laramupinajutuxefiv.pdfIn PDF document text
- http://fuguchair.com/upfolder/e/files/20210921031826.pdfIn PDF document text
- https://rtvpuls.com/ckfinder/userfiles/files/putumixubofema.pdfIn PDF document text
- http://studiofagiani.eu/userfiles/files/topulejolevufito.pdfIn PDF document text
- https://rm-parketi.si/uploads/papoxomejiruta.pdfIn PDF document text
- https://open-call.fr/uploaded/files/zujeke.pdfIn PDF document text
- http://assushop.com/userfiles/assushop.com/file/xujapebixapuraluwabejurad.pdfIn PDF document text
- https://bikeid.net/ckfinder/userfiles/files/20172351022.pdfIn PDF document text
- http://camelliafb.com/uploads/files/202109080656309179.pdfIn PDF document text
- http://to-tuong.com/media/ckfinder/files/19989790129.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_off0000bb0e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xBB0E	16096 bytes
SHA-256: `72f60a1269e97b2ab6d2c295dc297159af0dd07ac27a18728ce65c686d26f550`
`font_01_sfnt_off0000e3b7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE3B7	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0000fbce.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFBCE	10620 bytes
SHA-256: `399742e093e16e9e81ec71e8bcde565cdf36e7423c842f8232861f58c352abc3`

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