PDF malware analysis — malicious · d681bb779a161b43

MALICIOUS

PDF

85.1 KB Created: 2021-09-13 10:52:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14

MD5: a6ca94cda4f4cc1ece1fdc7dc1f95d3a SHA-1: 47f8cd7139c3d603c55fd173101058ae393900ab SHA-256: d681bb779a161b43928eab02483c08ff84cc196dd8527030e80811a3c24b4d77

146 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF document was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning model indicated a high probability of maliciousness. It contains numerous embedded URLs pointing to external sites, suggesting a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further indicates a pattern of using disposable hosting for a large number of links, reinforcing the malicious intent.

Machine Learning

Nyx PDF Classifier malicious score 0.9951

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.
QR-code redirect lure medium SE_QR_LURE

Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
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://infrive.ru/uplcv?utm_term=cara+membuat+app+android PDF link annotation
- https://termoformat.md/img/files/93895046868.pdfIn PDF document text
- http://ayurveda-shiatsu-qigong-nice.com/upload/files/23450842032.pdfIn PDF document text
- https://greenlandpark.com/uploads/files/51707403077.pdfIn PDF document text
- https://tannhatviet.vn/upload/files/milugod.pdfIn PDF document text
- http://kemmurad.com/webroot/img/files/wujewiwibunuzogebofimuzos.pdfIn PDF document text
- http://mini-garden.ru/userfiles/file/8944353259.pdfIn PDF document text
- https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fcf6e85d8b---dukisuwilabexexuwevupoke.pdfIn PDF document text
- http://spartapr.com/images/upload/file/88915510319.pdfIn PDF document text
- https://incoyun.com/calisma2/files/uploads/tonazamebalinezomigit.pdfIn PDF document text
- http://wonsakai.com/uploads/files/6913880595.pdfIn PDF document text
- https://clic-essc.ch/ck/ckfinder/userfiles/files/nibefaxadekatadabixes.pdfIn PDF document text
- http://harekatmemuru.com/images/Media/files/36809998972.pdfIn PDF document text
- http://esejsc.com/upload/files/pisovopenetexekisapodumab.pdfIn PDF document text
- https://robert-zauer.cz/userfiles/file/14150544831.pdfIn PDF document text
- http://vaness-sens.fr/ckfinder/userfiles/files/limotonunuwufojugazapepo.pdfIn PDF document text
- http://renknh.com/ckupload/files/40779764428.pdfIn PDF document text
- http://kammerchor-lindau.com/file/15016845272.pdfIn PDF document text
- http://yonseri.org/userfiles/files/kubelexabimib.pdfIn PDF document text
- http://hoaphathotel.com/luutru/files/zujolopaseromixuxiwefavu.pdfIn PDF document text
- https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16138e5fde2e87---biruguzumetedi.pdfIn PDF document text
- https://bloomlight.pl/_bloom/file/74890635705.pdfIn PDF document text
- https://grootformaatspandoeken.nl/userfiles/file/nusadezuxodifexi.pdfIn PDF document text
- http://deborahmayerlawoffices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/42118812891.pdfIn PDF document text
- http://xn--80aer5aza.xn--19-kmcm3c.xn--p1ai/ckfinder/userfiles/files/21734651387.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_off0000e40b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE40B	19500 bytes
SHA-256: `5985c073d794bd164551f5cc91bfff99be7c77eaa19f1512946d2faa0d66677f`
`font_01_sfnt_off00011715.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11715	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00012f2c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12F2C	10608 bytes
SHA-256: `c84651f3f33fb8f0aecac3cc2fdca9972b242047e00ed18b766d43c44d0159d6`

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