PDF malware analysis — malicious · a15b11760cf2f2dc

MALICIOUS

PDF

70.3 KB Created: 2021-09-12 10:05:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-24

MD5: 2b073d1ebe78ddee4aaaea21eaa84757 SHA-1: 7221e1ea1fc6f9a804bb8416302f47caefd93768 SHA-256: a15b11760cf2f2dcd990a945c151a476b8210a098aff0d2c461953ebda44ee70

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

Nyx PDF Classifier malicious score 0.9975

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 http://ubestsports.com/imager/files/20210912135431.pdf In PDF document text
- http://mosjob.ru/images/file/wikovikejab.pdfIn PDF document text
- https://salwangurugram.com/files/19622192779.pdfIn PDF document text
- http://icoenergia.com/userfiles/files/xokobapabemubap.pdfIn PDF document text
- http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137318477d2e---51821227974.pdfIn PDF document text
- http://keralabiblesociety.com/fck_uploads/file/88769291118.pdfIn PDF document text
- https://www.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/53071092477.pdfIn PDF document text
- https://dichvumayphoto.vn/webroot/img/files/buvobujesumoxegunot.pdfIn PDF document text
- http://kidneytracker.com/ckfinder/userfiles/files/61997882657.pdfIn PDF document text
- http://fabriquetextil.com/js/new/fckeditor/userfiles/file/78761431629.pdfIn PDF document text
- http://allycatering.com/userfiles/6419531205.pdfIn PDF document text
- http://shimamura-mail-order.com/userfiles/file/96869815535.pdfIn PDF document text
- http://orbitsecurity.qa/pro_mvp_tech/uploads/file/1215743049.pdfIn PDF document text
- https://ego-sofa.tw/uploads/files/202109041117413214.pdfIn PDF document text
- https://blokhol.com/upload/files/26834391479.pdfIn PDF document text
- https://accu-split.com/userfiles/files/vujuwumukevofavi.pdfIn PDF document text
- https://thucphamtruongxanh.com/Upload/files/juparaxuluvunap.pdfIn PDF document text
- http://hightopeducation.com/cms_uploaded/file/36948923957.pdfIn PDF document text
- http://saluteebenesseresas.it/userfiles/files/27925515707.pdfIn PDF document text
- http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/161365425591ef---duxebusekavodujurutanug.pdfIn PDF document text
- https://aakritidigitals.com/userfiles/files/57524432025.pdfIn PDF document text
- https://minhvuongthuphap.com/upload/ck/files/53405003779.pdfIn PDF document text
- http://ildungrice.com/fileupload/fckeditor/file/solelusobifiv.pdfIn PDF document text
- http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210903050910.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=book+of+vile+darkness+3.5+e+pdfPDF link annotation
- 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_off0000b484.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB484	10976 bytes
SHA-256: `82461952894d6541c6bf1361fef3ef839c21c7eca25626602b21432f76e1a701`
`font_01_sfnt_off0000ce2c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCE2C	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0000e63e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE63E	14956 bytes
SHA-256: `c7cb2f872317475e44dddbb683b23a40b75c45aa6a9bc8a4254dc0339dcff128`

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