PDF malware analysis — malicious · f1bb0c1650396053

MALICIOUS

PDF

69.7 KB Created: 2021-09-27 20:15:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25

MD5: 8f32bdb2c93bf62ce5024a421cff043b SHA-1: 6711a1abd6d77b8b9aeb391e696d0255d2d1b436 SHA-256: f1bb0c1650396053bfecce2f85a52a61eaadb351942438b1386166e518e370a8

126 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to external domains, suggesting it functions as a lure to phishing or malware download sites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a link farm on disposable hosting, a common tactic for distributing malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9975

Heuristics 5

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.
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://synerhu.ru/uplcv?utm_term=the+martian+chronicles+pdf+free+download PDF link annotation
- http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/uikqkk0r5euvstnbsej74a1cqs/gufufixevu.pdfIn PDF document text
- http://dsagco.com/Upload/file/94005742444.pdfIn PDF document text
- http://www.tractortools.cz/ckfinder/userfiles/files/85417840659.pdfIn PDF document text
- http://deborahmayerlawoffices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/81208836072.pdfIn PDF document text
- https://rybczewice.pl/userfiles/file/49326184832.pdfIn PDF document text
- https://samsungdvmklima.com/upload/ckfinder/files/fepagufefoxafopuzoj.pdfIn PDF document text
- https://pellevah.com/upload/files/girubaziloda.pdfIn PDF document text
- http://sanruou.com/app/webroot/uploads/files/90141374662.pdfIn PDF document text
- http://www.schule.havonix.com/ckfinder/userfiles/files/nogerorimubo.pdfIn PDF document text
- https://heks-tech.com/app/webroot/userfiles/files/28276233682.pdfIn PDF document text
- http://bdsps.org/slbdavbatala/userfiles/file/mulixazur.pdfIn PDF document text
- http://coytex.net/ckfinder/userfiles/files/piwuwoto.pdfIn PDF document text
- https://efnnma.org/files/file/4003413178.pdfIn PDF document text
- https://swaarm.de/app/webroot/upload/files/4851503233.pdfIn PDF document text
- http://wooshin.kr/uploaded/file/2121151708613d83649a6db.pdfIn PDF document text
- https://granitnet.hu/editor_up/75315925819.pdfIn PDF document text
- http://francescofesta.it/userfiles/files/sijamajawosisogatodu.pdfIn PDF document text
- http://francescasciortino.it/userfiles/files/gavawazemalopu.pdfIn PDF document text
- http://hoachathoanggia.com/userfiles/file/76444762793.pdfIn PDF document text
- https://conexus-study-abroad-travel.com/ckfinder/userfiles/file/21571390432.pdfIn PDF document text
- https://jobtiara.com/files/files/mowaxonisaxupeloviwu.pdfIn PDF document text
- http://haenuri.net/ckupload/files/woxubusagomi.pdfIn PDF document text
- https://eastmangroup.org/ckfinder/userfiles/files/wolip.pdfIn PDF document text
- http://bibliotekaludwin.pl/img/upload/files/49303928195.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_off0000b0f7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB0F7	10932 bytes
SHA-256: `8e6187f7c2c60c2418c8c6f3c4e7badb9e7a6fd48d5d0b81b1acd80ae7f8e4df`
`font_01_sfnt_off0000ca23.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCA23	15296 bytes
SHA-256: `e41119e65cbe92256e0bc92f20cd3cfb359f3b03cd435d868aba8cdcdbbb2c98`
`font_02_sfnt_off0000f093.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF093	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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