PDF malware analysis — malicious · 355b59a6482b0c28

MALICIOUS

PDF

82.7 KB Created: 2021-09-20 03:50:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: 2a590e541691d57726f639b57cac8a13 SHA-1: f6fbdd85477ee1fbdc17c25e47407cc6a1d089fe SHA-256: 355b59a6482b0c28b0f85308d83063bd6a272428902f6036ac95559f0a77cff7

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document contains numerous embedded URLs and a heuristic identified a 'download button' lure, suggesting a phishing or malware distribution attempt. The presence of external URIs and a link farm on disposable hosting further supports this assessment.

Machine Learning

Nyx PDF Classifier malicious score 0.9977

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.
Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON

Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
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://huntic.ru/uplcv?utm_term=htc+android+usb+driver+for+windows+xp PDF link annotation
- https://angkaganjil.com/contents/files/xigerakegitutanew.pdfIn PDF document text
- http://soles2walk.com/data/file/lizonilukelubax.pdfIn PDF document text
- http://restauraceeverest.cz/userfiles/file/bebigexoki.pdfIn PDF document text
- http://www.jindatunnel.com/up_files/file/52670054258.pdfIn PDF document text
- http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140f90e44889---96537226031.pdfIn PDF document text
- https://www.leadercaravans.com.au/application/third_party/ckfinder/userfiles/files/bewudowufuzipi.pdfIn PDF document text
- http://revistaspontan.ro/assets/ckfinder/core/connector/php/uploads/files/82141005439.pdfIn PDF document text
- https://highfieldhousehotel.net/nbloom/fckuploads/file/73366236112.pdfIn PDF document text
- https://mimpiindahsatu.com/contents/files/wosisijopagepepumixexen.pdfIn PDF document text
- https://dalnoboy.com/data/filestorage/upload/files/lezerukugazopepudej.pdfIn PDF document text
- http://chafewyuok.handysociality.com/upload/files/makutasoj.pdfIn PDF document text
- http://www.xn----9sbkvfu2aex3d.xn--p1ai/ckfinder/userfiles/files/87025157343.pdfIn PDF document text
- http://vinaktv.com/storage/ckfinder/files/17446820887.pdfIn PDF document text
- https://parkettworld.com/upload/files/pimasesujikenutubadova.pdfIn PDF document text
- https://trickapotisk.cz/webpagebuilder/ckfinder/userfiles/files/88001170466.pdfIn PDF document text
- http://vonschickenconcord.com/uploads/files/60020349898.pdfIn PDF document text
- https://uleiuri.ro/userfiles/file/lenisozoso.pdfIn PDF document text
- http://bubb.cn/up_file/file/74907597407.pdfIn PDF document text
- http://women-for-marriage.com/ckfinder/userfiles/files/24236085354.pdfIn PDF document text
- http://ibshop.gr/uploads/_uploads/files/mifuwutebenijabixik.pdfIn PDF document text
- https://etravelbox.com/scgtest/team-explore/uploads/files/vatekoxalonokifojazuj.pdfIn PDF document text
- https://organicfertilizerproduction.com/d/files/pesinamezem.pdfIn PDF document text
- http://ahknchem.com/upload/files/42300254969.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_off0000d9c7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD9C7	11052 bytes
SHA-256: `617d97e424beb8a0fb445eb9b00dfd4eb7bfca497d5d6515f76c993ffc51f176`
`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	18568 bytes
SHA-256: `c6af86b907676ff32d7970ec8319f533fd81ae990a249ba81d2580b711486eed`

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