PDF malware analysis — malicious · 68edc5f5da9e7cf8

MALICIOUS

PDF

79.7 KB Created: 2021-09-20 00:05:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 0fcba3db470da664e8ce953c0e21b770 SHA-1: a58476fb8a1d73f1a14addaae12baf3349ee5541 SHA-256: 68edc5f5da9e7cf81a08850f48d1f3e92bda90ff740c95b7f776ff6e9d2dee06

166 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier. Heuristics indicate it contains external URIs and is part of a link farm, suggesting a phishing or redirection attempt. The 'SE_CLICKFIX' heuristic specifically notes that the document instructs the user to press Win+R or paste a command, which is a common social engineering tactic to bypass security measures and execute malicious payloads.

Machine Learning

Nyx PDF Classifier malicious score 0.9960

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
ClickFix social engineering attack high SE_CLICKFIX

Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
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.
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://queure.ru/uplcv?utm_term=dark+mode+chrome+app PDF link annotation
- https://nhabe.com.vn/ckfinder/userfiles/files/tasovoniwegul.pdfIn PDF document text
- https://ecoledesgourmets.com/userfiles/file/dukodoluxulibijolusonugas.pdfIn PDF document text
- http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161328d58175d2---2771690300.pdfIn PDF document text
- http://www.grupoaccs.net/ckfinder/userfiles/files/variduvixefez.pdfIn PDF document text
- http://silverspringabw.com/uploads/files/21813799553.pdfIn PDF document text
- http://dtpokebar.com/uploads/files/32875707298.pdfIn PDF document text
- http://xn--22cjbbm2eyae3ehabdb4kqdtae3dxnnc1fhf.com/user_img/files/97222614731.pdfIn PDF document text
- https://hobbyschuurtje-webwinkel.be/images/userfiles/file/wikefe.pdfIn PDF document text
- http://vce34.ru/attachments/file/33063159145.pdfIn PDF document text
- http://mycoapaisyl.com/webimages/files/96464180088.pdfIn PDF document text
- http://www.szphotar.com/admin/img/files/zifogexukujukusev.pdfIn PDF document text
- http://roomyab.ir/basefile/roomyabir/files/tifajoretavof.pdfIn PDF document text
- http://labellebeaute.com.hk/ckfinder/userfiles/files/87259445665.pdfIn PDF document text
- http://wyadonline.com/userfiles/file/27256240075.pdfIn PDF document text
- https://mandarinusa.com/userfiles/file/1631832398.pdfIn PDF document text
- https://delaneyllc.com/ckfinder/userfiles/files/67896087374.pdfIn PDF document text
- http://aodaibooking.com/FileData/ckfinder/files/20210911_C183D3EE65B56B23.pdfIn PDF document text
- https://kluchar.net/klucharnet/images/file/65653912234.pdfIn PDF document text
- http://lmleadmanagement.com/userfiles/files/buzizagidap.pdfIn PDF document text
- http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/161448bf2aa6f0---29421277155.pdfIn PDF document text
- https://mylin.in/ckeditor/ckfinder/userfiles/files/zaxako.pdfIn PDF document text
- http://bydnjl.com/userfiles/files/togipuzikuzo.pdfIn PDF document text
- http://konberdbio.com/upload/files/tofegoxur.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_off0000d578.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD578	17024 bytes
SHA-256: `7de6635eaac3302ed8bb5736a24e1c48128b0172fd625d542ce490344e9d096b`
`font_01_sfnt_off000101f5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x101F5	10364 bytes
SHA-256: `3e92383fe5435358ebfc7d77267b31c62e66732bda1963df9623f32a1d16d582`
`font_02_sfnt_off00011953.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11953	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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