PDF malware analysis — malicious · 4376c388d71b37c5

MALICIOUS

PDF

92.3 KB Created: 2021-09-16 16:49:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: f05b91e16f4ecb130b175536b609c652 SHA-1: 25b80ffcc72c0637ff4c39af2986290d88fcea26 SHA-256: 4376c388d71b37c5a27db8feb6fb2aece2b00166cf5894de39a438d91ec2e480

126 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs pointing to external domains, many of which are structured as link farms. The PDF_URI heuristic specifically identified a URL likely used for phishing or malware delivery. While no scripts were explicitly extracted, the nature of the embedded URLs and the link farm heuristic suggest an intent to redirect the user to malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9937

Heuristics 5

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.
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://coretry.ru/uplcv?utm_term=setting+up+android+phone PDF link annotation
- http://mikol-styl.cz/userfiles/file/nibojimesubar.pdfIn PDF document text
- http://www.nena-artspace.com/ckfinder/userfiles/files/gesarixenuf.pdfIn PDF document text
- http://nickels.design/ckfinder/userfiles/files/24333464130.pdfIn PDF document text
- http://hoanggiaphatland.com/uploads/image/files/xofusijisusefufuwan.pdfIn PDF document text
- https://powerliteaac.com/userfiles/file/76390827675.pdfIn PDF document text
- https://goez3.com/10005001208290177/ckfinder/userfiles/files/80406459959.pdfIn PDF document text
- https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/ce95a47a0af9ea1d4921363e372d4779/37336486626.pdfIn PDF document text
- https://needletherapy.eu/upload/file/suwagaxer.pdfIn PDF document text
- http://dietetyka-24.pl/images/files/58238250401.pdfIn PDF document text
- http://www.espace-hotelier.com/ckfinder/userfiles/files/menadexemilepubujepabuwas.pdfIn PDF document text
- http://www.jindatunnel.com/up_files/file/dorizukufuzatupifej.pdfIn PDF document text
- http://www.somdattabasu.com/fckimages/file/nufudizivadufav.pdfIn PDF document text
- http://goddesshair.net/upload/users/files/ponabavibasarokarubewap.pdfIn PDF document text
- http://hardiebase.com/uploads/assets/filefile/60419213694.pdfIn PDF document text
- http://cokhihoangvinh.com/uploads/userfiles/file/rolesoxex.pdfIn PDF document text
- http://tonghuichem.com/upload/files/ruzifanafisogidagolibalid.pdfIn PDF document text
- https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/16136713bd0ebc---terofefaga.pdfIn PDF document text
- https://ncltandatbar.com/home/ncltandat/public_html/dowalumniusa/ckfinder/userfiles/files/sefizeki.pdfIn PDF document text
- https://whitepalacegrill.com/userfiles/zunoxuxafixapomufok.pdfIn PDF document text
- https://juraganmonyet.com/contents/files/14446850495.pdfIn PDF document text
- http://agriturismolataggiasca.eu/userfiles/files/josetadorofuwipesunisuxim.pdfIn PDF document text
- http://rejs2013.cycling-recycling.eu/imgturysta/files/misasotawe.pdfIn PDF document text
- http://saddabro.com/userfiles/file/duxivuvusew.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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000e8e0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE8E0	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off000100f1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x100F1	17820 bytes
SHA-256: `1ec9e5054c03720ec2df92d65b6adeed84669e9622e7762218d2c42627a475e2`
`font_02_sfnt_off00011c7b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11C7B	10632 bytes
SHA-256: `07f7df5a7564e3018bf2c0204e5213f1e2ebc2ee390e8fe9cf74e058dd19512c`
`font_03_sfnt_off00013485.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13485	17812 bytes
SHA-256: `e2ae9fb70b27110a128ae0ba2b9685db5d437f63abb824bfe541517813b2932c`

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