PDF malware analysis — malicious · 7f6a0afdaa93987f

MALICIOUS

PDF

85.1 KB Created: 2021-09-17 01:22:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: 2bbebf9bbe19ccbebef1289083e230e7 SHA-1: 6b3d9f7ad4e37a5c7cd104fd336ce7a7700a618c SHA-256: 7f6a0afdaa93987fbe42686697020b04bef344d41868aa6855858bdf60c50020

166 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on disposable domains and appear to be part of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The heuristic 'PDF_RANDOM_URL_LINK' specifically points to a suspicious PDF hosted on 'ambulatorioveterinariocigliano.com', which is a key indicator of malicious activity.

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://krisoc.ru/uplcv?utm_term=use+phone+as+bluetooth+gamepad PDF link annotation
- http://geoplan.su/userfiles/file/22493602556.pdfIn PDF document text
- https://music-group-store.com/upload/files/baserotadanifirivizigaz.pdfIn PDF document text
- http://www.brickchamber.com/ckfinder/userfiles/files/losaxazirakagazefuzikofod.pdfIn PDF document text
- http://vettercycles.ch/userfiles/files/vinigotefi.pdfIn PDF document text
- http://prplus4u.com/ckupload/files/duzekegulop.pdfIn PDF document text
- https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/hma4voop36cuvpmhush470knn2/barelipovomaj.pdfIn PDF document text
- http://drapikowski.pl/uploaded/fck_files/file/pusolazutodopazuk.pdfIn PDF document text
- http://zhjpharm.com/upload/files/19802694918.pdfIn PDF document text
- http://dlastudenta.org/Upload/file/kunobenujoji.pdfIn PDF document text
- https://mkontroll.hu/File/52700748430.pdfIn PDF document text
- https://gamedunyasi.com/calisma2/files/uploads/fenimanarapu.pdfIn PDF document text
- http://ambulatorioveterinariocigliano.com/userfiles/files/95734390256.pdfIn PDF document text
- http://huthamcauquanggiap.com/upload/files/bopevo.pdfIn PDF document text
- https://mygrind.ie/userfiles/file/49027061501.pdfIn PDF document text
- https://perkunasstudio.com/uploads/files/202109040648495606.pdfIn PDF document text
- https://ijieet.org/ckfinder/userfiles/files/61870511440.pdfIn PDF document text
- http://pattarasawat.com/ckfinder/userfiles/files/92299009943.pdfIn PDF document text
- http://zezoalza.com/ckupload/files/71759664207.pdfIn PDF document text
- https://sadhankendra.org/erc/media/mapetuvivigonom.pdfIn PDF document text
- http://xn----8sbaqfskngn1qi.xn--p1ai/userfiles/file/kutanewewepagoxajafe.pdfIn PDF document text
- http://kondicionery-dzerzhinskij.ru/upload_picture/file/28483055787.pdfIn PDF document text
- https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138ec22bd008---latuf.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_off0000e7fb.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE7FB	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off00010012.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10012	10892 bytes
SHA-256: `e726dcf56d2830a4825f344f7b0fbd7f17c1ceb24f9ca8b601a64f7b2b29ad17`
`font_02_sfnt_off000118ad.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x118AD	17996 bytes
SHA-256: `883a340945bccc72f42e6e6aaf15967c32d93a67a9de3133374a464471eb082f`

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