PDF malware analysis — malicious · 722c86a04a89322d

MALICIOUS

PDF

81.5 KB Created: 2021-09-21 04:56:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14

MD5: 97728ba756de9cd49868621ae5ec690b SHA-1: b605e1b8ce8554b47bc17e39c70d9cd92a8cd50d SHA-256: 722c86a04a89322d090619d8b63266fd3984789ea3f9158408e9327642f7ecc9

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to disposable hosting. The presence of 'utm_term' parameters in some URLs suggests an attempt to track user interactions with these malicious links.

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.
Urgency / deadline lure low SE_URGENCY_LURE

Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
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://archism.ru/uplcv?utm_term=flamingo+app+video+maker PDF link annotation
- http://mail-business.ru/uploads/file/xakuguwokirexolebadije.pdfIn PDF document text
- http://cyc.cz/pictures/clanky/files/xegabip.pdfIn PDF document text
- https://highlander-inn.com/assets/userfiles/files/tofeperevinetuvu.pdfIn PDF document text
- https://opsclown.it/ckfinder/userfiles/files/fisotajaluviz.pdfIn PDF document text
- http://onlinecommerce.bg/uploads/pages/files/41291690176.pdfIn PDF document text
- http://orthodoxnews.us/file/1962528048.pdfIn PDF document text
- https://dpengineers.info/admin/userfiles/file/gapijuwunuz.pdfIn PDF document text
- http://ez-surveying.com/htdocs/cljr/data/files/57306852330.pdfIn PDF document text
- https://shreenathtechnologies.com/userfiles/file/gugulopilo.pdfIn PDF document text
- https://0800-707-808.com/upload/ckfinder_temp/files/20210917201058.pdfIn PDF document text
- https://ahha.az/userfiles/file/40663038466.pdfIn PDF document text
- http://educasters.co/ckfinder/userfiles/files/xokasadibedowe.pdfIn PDF document text
- https://kominove-centrum.cz/media/files/file/vefiwina.pdfIn PDF document text
- http://hcstonetw.com/uploads/files/202109180343496462.pdfIn PDF document text
- https://sanipro.ma/app/webroot/uploaderfiles/16672097799.pdfIn PDF document text
- http://bindashnews.com/userfiles/file/72427443202.pdfIn PDF document text
- http://laboratorioshamalab.com/userfiles/file/vixopewaforuwatodan.pdfIn PDF document text
- http://vagyonvedelemszolnok.hu/admin/fck_upload/file/zelolavupobasava.pdfIn PDF document text
- http://www.vishalsahni.com/public/ckfinder/userfiles/files/3335383022.pdfIn PDF document text
- https://biserica-izvorul-tamaduirii.ro/files/30331979269.pdfIn PDF document text
- https://stiglic.sk/userfiles/file/70346931904.pdfIn PDF document text
- https://www.opsclown.it/ckfinder/userfiles/files/46236426136.pdfIn PDF document text
- https://vaitinhdien.com/app/webroot/upload/files/19422233533.pdfIn PDF document text
- https://greenline.bg/userfiles/file/91466552312.pdfIn PDF document text
- http://sobateracota.ro/mm/file/likajil.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_off0000d981.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD981	17880 bytes
SHA-256: `cd39e16062fa721582054acaf18affd32883cddf31726c7fdaaaad150a6563eb`
`font_01_sfnt_off00010864.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10864	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0001207b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1207B	10604 bytes
SHA-256: `33a78536b9a6aacdaf0225271f5996fb3c2be15e9bac060bcca8e2d1cfb04575`

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