PDF malware analysis — malicious · f11da79bc5b410f9

MALICIOUS

PDF

86.7 KB Created: 2021-09-20 09:24:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: 8ba7c4a9f399b793a20d70372645fc94 SHA-1: f1293d4f954d159b3f336701270782fa51ded165 SHA-256: f11da79bc5b410f9b1ecca2b3acc2ec422e199127beb34cb6eb8c99b67646f02

166 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains multiple external links, with one heuristic specifically identifying it as a link farm hosted on disposable domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9980

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
PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK

PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
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://allytemp.ru/uplcv?utm_term=among+us+game+download+pc+windows+7 PDF link annotation
- http://britishcytology.org.uk/ckfinder/userfiles/files/wexapidowimusixuloxovirux.pdfIn PDF document text
- http://hoaisonland.vn/upload/files/gujelajujilotedogobanu.pdfIn PDF document text
- http://iweldbot.com/ckfinder/pho/files/84731263821.pdfIn PDF document text
- https://cristalensi.com/public/File/7801993439.pdfIn PDF document text
- https://airin.lv/images/userfiles/file/4808551415.pdfIn PDF document text
- http://huijingweb.com/upload_fck/file/2021-9-16/20210916100827513231.pdfIn PDF document text
- http://veterinarioassociatopacinidallatorre.eu/userfiles/files/85786077463.pdfIn PDF document text
- http://togul.org/sites/default/files/file/zamotabepemabiwi.pdfIn PDF document text
- http://adatarimhayvancilik.com/Images/Media/files/getisurukuxodogomap.pdfIn PDF document text
- https://ketex.com/trcgp/ckfinder/userfiles/files/jesigapamosogos.pdfIn PDF document text
- http://cichanski.com/Upload/file/votubimo.pdfIn PDF document text
- http://spakimthi.com/upload/files/fonudu.pdfIn PDF document text
- http://eaas-journal.org/survey/userfiles/files/68365531689.pdfIn PDF document text
- http://www.bc-arman.kz/ckfinder/userfiles/files/51631030499.pdfIn PDF document text
- http://sqc.jp/user_data/editor/ckfinder/core/connector/php/upload/files/fugelowivunugazerajiwusa.pdfIn PDF document text
- https://biocoop.legreniervert.fr/ckfinder/userfiles/files/texixubosa.pdfIn PDF document text
- http://wisdomtours.net/upload/file/34814372571.pdfIn PDF document text
- http://zhhyhb.com/uploadfiles/files/65677615103.pdfIn PDF document text
- http://gaestehaus-am-erlkoenig.de/img/editor/file/80066792370.pdfIn PDF document text
- https://sailstudy.in/ckfinder/userfiles/files/koxuxesepaluxuwawepi.pdfIn PDF document text
- http://aftp.bg/userfiles/file/84030604361.pdfIn PDF document text
- http://heatexchangersolution.com/upload_fck/file/2021-9-6/20210906060618502808.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_off0000ebf4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEBF4	18592 bytes
SHA-256: `d0ac6e4a0e4e1beb2250df2c242a1405b041ec16ee05bccd8edce355069f47df`
`font_01_sfnt_off00011bf2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11BF2	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00013409.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13409	10876 bytes
SHA-256: `fa19b11194ed0818d7ea361315f79d6a4f2813fc872d9bbdc118f9df5bef1895`

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