PDF malware analysis — malicious · cb615745347afefc

MALICIOUS

PDF

255.4 KB Created: 2022-05-17 14:03:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2022-07-15

MD5: 5c6461089137e4f83cb5eb4ad196d230 SHA-1: 77fbd8d8990f9bc7691cf9156a7c7d4f42e0a51f SHA-256: cb615745347afefce51eb02c3f2d91d9af943e035a9ca86eb097b8d58230a485

96 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1204.002 Malicious File

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to a suspicious URL, which is likely intended to trick the user into downloading a secondary malicious payload. The document body is heavily obfuscated and appears to be non-readable content generated by wkhtmltopdf, further suggesting a malicious intent rather than legitimate document content.

Machine Learning

Nyx PDF Classifier malicious score 0.8804

Heuristics 4

ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
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://mifuj.co.za/XSRYdR1H?utm_term=aoac+991.+14+pdf+download+windows+10+64-bit64+bit
- http://dansecyr.ca/pdf/file/62520860115.pdf
- https://werakemil.weebly.com/uploads/1/3/5/9/135973214/zufogukuwetorugug.pdf
- https://warevinigipa.weebly.com/uploads/1/3/4/8/134898994/b5688d9e4e94ffa.pdf
- https://tevipane.weebly.com/uploads/1/3/2/6/132681072/767075f.pdf
- https://kanefudejezem.weebly.com/uploads/1/3/6/0/136056225/pegiv.pdf
- https://vnjhanoi.com/upload/files/makovozejapezugudis.pdf
- http://robodit.ru/kcfinder/upload/files/kuxosazun.pdf
- https://kidepexabosu.weebly.com/uploads/1/3/4/2/134266059/jamib_mexituwanibi_mevasuditaweju_fomafumunuj.pdf
- https://zezuwosizu.weebly.com/uploads/1/3/4/4/134459619/712301d.pdf
- https://baliwiwun.weebly.com/uploads/1/3/1/3/131380001/910cdf1d1c0e8d4.pdf
- https://kujofajatoniw.weebly.com/uploads/1/3/1/4/131406813/1155108.pdf
- https://mobilaide.com/upload/editor/file/takugusobuxafanikajomekod.pdf
- http://angarakshaksecurity.com/userfiles/file/suvelujinurejadoret.pdf
- https://festacontinua.it/public/file/ziwasoxunuvaki.pdf
- https://rasetevipumi.weebly.com/uploads/1/3/4/7/134714044/532793.pdf
- http://www.w3.org/1999/02/22-rdf-syntax-ns#
- http://purl.org/dc/elements/1.1/
- http://ns.adobe.com/pdf/1.3/
- http://ns.adobe.com/xap/1.0/
- http://ns.adobe.com/xap/1.0/mm/
- http://ns.adobe.com/xap/1.0/rights/
- http://dejavu.sourceforge.net
- http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off000388d1.bin` `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x388D1	16792 bytes
`font_01_sfnt_off0003a0e3.bin` `d19a4122b920fd2fccd743d9c0d673f62734bb267e54f80d08d06ae579b59107`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x3A0E3	20272 bytes
`font_02_sfnt_off0003d46f.bin` `afee398ff41f6fb190d14a7e4308b14ed4ec6760ae12d12249a0be29212ac076`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x3D46F	11276 bytes

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