PDF malware analysis — malicious · fa6ecda16476803e

MALICIOUS

PDF

82.0 KB Created: 2021-09-15 15:45:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27

MD5: e436d5abb647c7104128181bff7d98aa SHA-1: 324c1bf8be8f18e0f371bc82e3b1ed125891f43f SHA-256: fa6ecda16476803eb95eb4c0a17604cbbdbc7c5d08e1857ee964253af4187baa

146 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier with high confidence. It contains numerous embedded URLs, many of which are hosted on disposable domains and utilize UTM parameters, indicating a link farm or phishing lure. The document body is heavily obfuscated, but the presence of embedded URLs and the heuristic firings strongly suggest an attempt to redirect users to malicious sites for phishing or malware delivery.

Machine Learning

Nyx PDF Classifier malicious score 0.9974

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://laborke.ru/uplcv?utm_term=apowermirror+software+for+pc+free+download PDF link annotation
- http://accronline.com/userfiles/file/vasukadigotupujudikowexu.pdfIn PDF document text
- https://coebmsf.com/userfiles/file/66433161371.pdfIn PDF document text
- http://xn--90aoaidn.xn--p1ai/ckfinder/userfiles/files/jugav.pdfIn PDF document text
- http://homeloanz.net/images/e/file/musigodexufisuxukumas.pdfIn PDF document text
- http://venusland.vn/app/webroot/img/files/92221708176.pdfIn PDF document text
- http://balone.net/_upload/file///16516742986.pdfIn PDF document text
- https://dadesigning.com/daduserfiles/files/bemufukifekudef.pdfIn PDF document text
- http://hastensandbreakfast.nl/userfiles/file/87189421152.pdfIn PDF document text
- https://concurs-euclid.ro/upload/fck/69338769238.pdfIn PDF document text
- http://hockjoohin.com/admin/uploads/file/botipuxasiku.pdfIn PDF document text
- http://cesishotel.com/res/wysiwyg/file/66451159352.pdfIn PDF document text
- https://thic.net/plugin/ce1/ckfinder/userfiles/files/97937143851.pdfIn PDF document text
- http://xn--80aaaaaikdebj9ccf1ayja1b5a3q.xn--p1ai/ckfinder/userfiles/files/33496556921.pdfIn PDF document text
- http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/161416cef38484---xiwoditilakuwiribapimug.pdfIn PDF document text
- https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/c8c0f0c085598bb3abc781e7119914ba/85895900719.pdfIn PDF document text
- https://phuquiland.com/upload/files/13683719796.pdfIn PDF document text
- http://dtjxbpzx.com/filespath/files/20210913013748.pdfIn PDF document text
- http://alphanaturehk.com/userfiles/file/bixisofoba.pdfIn PDF document text
- http://hotechike.com/files/files/71185865599.pdfIn PDF document text
- https://promtour-rural.ro/userfiles/file/64254482782.pdfIn PDF document text
- http://nhatrangpalace.vn/app/webroot/upload/files/muvodumabafatefus.pdfIn PDF document text
- http://defhjdr.friend-match.com/upload/files/8981404048.pdfIn PDF document text
- http://chiangmai-esc.net/user_img/files/verejiwowulazonibudive.pdfIn PDF document text
- http://safires.cz/ckfinder/userfiles/files/39007637178.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_off0000dd0c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDD0C	10848 bytes
SHA-256: `109293b5aa0f2157a98af3a9c348d0778ae92c866f1c37db717435a77f340e2b`
`font_01_sfnt_off0000f627.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF627	16900 bytes
SHA-256: `2e6b3f8bfa64dcff29ad257bd7a9316867d2374f4a6e3e8fef9fab35ef4ea126`
`font_02_sfnt_off000121a9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x121A9	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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