PDF malware analysis — malicious · 863d73f22604912c

MALICIOUS

PDF

90.3 KB Created: 2021-09-21 00:20:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: 380498ec6364c6d6346bd019da964d72 SHA-1: 0cf2446b028755721a0e4e6e58a519f319b87715 SHA-256: 863d73f22604912cfe325b182b631daebde6cae656a7f4c8f2f32f4173267f46

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to numerous external URLs, many of which are hosted on disposable domains. The presence of 'utm_term' parameters suggests an attempt to track user interactions, common in phishing or malware distribution campaigns.

Machine Learning

Nyx PDF Classifier malicious score 0.9973

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://crewmak.ru/uplcv?utm_term=roblox+sound+id PDF link annotation
- https://luatsubienhoa.com/upload/ck/files/xapubavizeju.pdfIn PDF document text
- https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144031be776a---fexiw.pdfIn PDF document text
- https://rimi.sk/userfiles/file/48438186479.pdfIn PDF document text
- http://www.ez4parcel.net/upfile/files/2021/09/15/xutojudanitifolubuge.pdfIn PDF document text
- http://ytovietnam.net/ckfinder/userfiles/files/lumusarebolemoletakiv.pdfIn PDF document text
- https://pharma-tools.pl/galeria/file/vomamud.pdfIn PDF document text
- http://ymmicro.com/files/files/25876862449.pdfIn PDF document text
- https://profipreklady.cz/www/ckfinder/userfiles/files/58040218383.pdfIn PDF document text
- https://rh4-h1tapi-turbo.com/contents/files/15564557052.pdfIn PDF document text
- http://harnettcountyhba.com/userfiles/file/45111752177.pdfIn PDF document text
- http://www.tiendadelbordado.com/ckfinder/userfiles/files/48346869051.pdfIn PDF document text
- http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a792487071---55068627480.pdfIn PDF document text
- http://www.taimaobi.com/admin/ckfinder/userfiles/files/tuvedexazutale.pdfIn PDF document text
- http://mobiliteit.nu/files/reniwosotakizokuberowal.pdfIn PDF document text
- https://diphong.com/uploads/97087963771.pdfIn PDF document text
- http://all4pets.cz/ckfinder/userfiles/files/83005494360.pdfIn PDF document text
- https://38e5bbdfe8be.gdziezjesc.info/userfiles/file/gibaropirexal.pdfIn PDF document text
- https://dortmundpools.com/contents/files/wepis.pdfIn PDF document text
- https://mycocoa.org/images/upload/files/88733156025.pdfIn PDF document text
- https://sleepthai.com/piceditor/file/zerokegu.pdfIn PDF document text
- http://nikkenj.com/userfiles/file/firebaze.pdfIn PDF document text
- https://warsztatgdynia.pl/app/webroot/media/files/78785082501.pdfIn PDF document text
- http://onyx-innovations.com/assets/ckfinder/userfiles/files/vijiva.pdfIn PDF document text
- http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f33cfbf40a---molonaxutegugisik.pdfIn PDF document text
- http://mylivediamondinventory.com/uploads/files/zoxaruribifodi.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_off0000f6ed.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF6ED	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off00010eff.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10EFF	20568 bytes
SHA-256: `039f5fcdc4518a4aacd9e677e6baf176029fc0015d8feed91d1fe9f20a80b2de`
`font_02_sfnt_off000144f6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x144F6	10136 bytes
SHA-256: `3451e963882b1115c0d1a2d7f88fd88bfb32ddd5848a74c0938ceb1a2e521002`

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