PDF malware analysis — malicious · a8f3798902011446

MALICIOUS

PDF

81.5 KB Created: 2021-09-18 18:21:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 1b7177e6f81bec0567a642d5e6c90c95 SHA-1: 2e9ced2cfcd749a0489c13e67b05c81512c262c5 SHA-256: a8f379890201144622602a8eaa5d9cd0ff1974da9e881c268a54982a9287cc1f

126 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, a common tactic for distributing malware or conducting phishing campaigns. The presence of external URIs and the 'link farm' heuristic strongly suggest a malicious intent to redirect users to potentially harmful sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9991

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://philabc.ru/uplcv?utm_term=how+to+change+play+store+location+in+android PDF link annotation
- http://dolonchem.com/upload/files/vunojajavazonedorumas.pdfIn PDF document text
- https://jpt.mysmartedu.com/uploadimages/files/6461203983.pdfIn PDF document text
- http://hndgyl.com/v15/Upload/file/20219171733386707.pdfIn PDF document text
- http://ls12368.com/userfiles/file/bitadafogeririnerem.pdfIn PDF document text
- http://gardatrans.com/content/Files/kamunev.pdfIn PDF document text
- http://smsalumni1971.com/apadmin/uploads/userfiles/files/pojazijivid.pdfIn PDF document text
- http://texmet.pl/userimages/file/jonebapilojipejatojaf.pdfIn PDF document text
- http://didula.com/img/file/95352167906.pdfIn PDF document text
- http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/vejotorikejumopa.pdfIn PDF document text
- http://dharmapuridiocese.com/svnprojects/DHD/Source/images/files/2820614149.pdfIn PDF document text
- https://haps.company/wp-content/plugins/super-forms/uploads/php/files/33fbdceb7d0f22cda5c377f79b04ae7b/nitewezumar.pdfIn PDF document text
- https://nazrabilisim.com/calisma2/files/uploads/1117202260.pdfIn PDF document text
- https://adamant54.ru/userfiles/files/laxakebanopidazubisupet.pdfIn PDF document text
- https://romalasergroup.com/userfiles/files/40988606306.pdfIn PDF document text
- http://olympicthesportshop.in/uploads/21614860641.pdfIn PDF document text
- https://igruppe.no/ckfinder/userfiles/files/75070131201.pdfIn PDF document text
- http://vimbark.sk/editor_uploads/files/8003652127.pdfIn PDF document text
- http://gearonlaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kitonajigasubilimal.pdfIn PDF document text
- https://aventura-agence.lu/userfiles/files/31311213820.pdfIn PDF document text
- https://rosenstein.lu/userfiles/files/40718018494.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_off0000da36.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDA36	10984 bytes
SHA-256: `b758948e5c5fc6e6231e20bc13fc78d8669395f54671eacee8b5f4c563d0852b`
`font_01_sfnt_off0000f384.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF384	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00010b96.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10B96	17244 bytes
SHA-256: `23af35eeb027b291cff967b45d24dcbbde57d184f93416e418253ff4a69176a7`

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