PDF malware analysis — malicious · 82b7eeb9abdb1cd6

MALICIOUS

PDF

83.9 KB Created: 2021-09-13 22:24:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27

MD5: 29880889e6aa9d4c4d5c6d7d0a7bbda0 SHA-1: 2df8baaa3e329345fade72006827ad4e01172846 SHA-256: 82b7eeb9abdb1cd6f16ea0311121b0889d962dfbe080901337ac84d54cc26ce9

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and numerous external URIs, including a link farm, suggests an attempt to redirect users to potentially harmful content or for SEO manipulation. The primary URL identified points to a link farm with many distinct hosts, indicating a coordinated effort to distribute content or traffic.

Machine Learning

Nyx PDF Classifier malicious score 0.9974

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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.
Embedded JS stream low PDF_JS

PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
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 http://xn--franzsischebulldoggen-lec.eu/userfiles/file/30918025085.pdf In PDF document text
- http://olech-rzeszow.pl/userfiles/file/14514354922.pdfIn PDF document text
- https://efckrakow.pl/userfiles/file/veximokak.pdfIn PDF document text
- http://tythb.com/uploadfile/files/37789429257.pdfIn PDF document text
- http://sun-green.eu/ckfinder/userfiles/files/1698277489.pdfIn PDF document text
- https://media-get.com/userfiles/files/95030337557.pdfIn PDF document text
- https://www.acta-mobilier.fr/ckfinder/userfiles/files/vifojunaxive.pdfIn PDF document text
- http://kientrucphatloc.com/upload/files/pigoweletozoxuxogiwu.pdfIn PDF document text
- http://kwiatmetal.pl/userfiles/file/tazija.pdfIn PDF document text
- https://bouveau-consulting.com/userfiles/file/13950228778.pdfIn PDF document text
- http://wxmx.cn/upload/ckimg/files/202109020357569294.pdfIn PDF document text
- https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f65f1800d5---91443511646.pdfIn PDF document text
- https://tatvan.in/userfiles/file/mapiwijiwakiraguj.pdfIn PDF document text
- https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/39681595681.pdfIn PDF document text
- http://www.portofmiamitunnel.com/system/js/back/ckfinder/userfiles/files/32727284954.pdfIn PDF document text
- https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e949688d8e---22576462488.pdfIn PDF document text
- http://aranysolyomfeszke.hu/editor_up/80291717204.pdfIn PDF document text
- http://goldenteriyaki.com/uploads/files/togazumevubovodi.pdfIn PDF document text
- https://reniuved.it/file/12389173046.pdfIn PDF document text
- https://gameadvisers.com/js/new/fckeditor/userfiles/file/30743107693.pdfIn PDF document text
- http://mauchlineware.com/html/chapelstreet/web/userfiles/files/semarukod.pdfIn PDF document text
- https://heart-calligraphy.com/uploads/files/202109101044099444.pdfIn PDF document text
- http://industrialsupplies.pk/userfiles/files/15494496527.pdfIn PDF document text
- http://gfb.it/upload/fck/file/82490772095.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=sword+art+online+alicization+dub+freePDF link annotation
- 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_off0000e738.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE738	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000ff4a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFF4A	16120 bytes
SHA-256: `6f0769f8b7568321a100ab30df2dbd69d1d3df9b873279af16696243a706ae94`
`font_02_sfnt_off000128ce.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x128CE	10764 bytes
SHA-256: `901306cce8bde601d8d90292212bb6b25380993c6cd1844f80e579d327829b12`

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