PDF malware analysis — malicious · 99706d6a9b16e78d

MALICIOUS

PDF

78.9 KB Created: 2021-09-13 06:04:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14

MD5: 0455167b8fb5995c4f401b5b0a848405 SHA-1: a98993e3b636a8b1ed59d4cd32c0a0a7be1d151d SHA-256: 99706d6a9b16e78dae7ad2d7739dd5146b6feeefe26ba4bd058a9ff8ba5626a0

126 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF document 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, indicating a phishing or malware distribution attempt. The presence of external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest the document's purpose is to redirect users to malicious sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9933

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://hram-uspeniya.ru/ckfinder/userfiles/files/6211518397.pdf In PDF document text
- http://maymaygiaydachidang.com/upload/files/43719894645.pdfIn PDF document text
- http://gianenricofabro.com/userfiles/files/5425634822.pdfIn PDF document text
- http://avtrak.ru/ckfinder/userfiles/files/nolebudabajabeni.pdfIn PDF document text
- http://profstil.az/userfiles/file/pezapuwetelujevujidipix.pdfIn PDF document text
- https://stef-nancy.fr/upload/document/zijomexow.pdfIn PDF document text
- http://platypusspot.org/uploads/ckfinder/userfiles/files/ximapugugudetidu.pdfIn PDF document text
- http://gpkoaee.ru/ckfinder/userfiles/files/44221235932.pdfIn PDF document text
- http://dep14kirov.ru/userfiles/file/zeradebaxajegakawa.pdfIn PDF document text
- http://xn--80aafmoni2biho.xn--p1ai/admin/ckfinder/userfiles/files/19075183554.pdfIn PDF document text
- http://ecole.ru/text/images/file/90346574982.pdfIn PDF document text
- https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/028bssnjbm2ahb97nbabgiup3l/30175933847.pdfIn PDF document text
- http://reelproductionshd.com/userfiles/file/winujafodajesirorokomize.pdfIn PDF document text
- https://cqhuaan.myhost360.cn/upload/files/09-08-04-33-24-27.pdfIn PDF document text
- http://tingchucontrol.com/Uploadfiles/files/47274151993.pdfIn PDF document text
- https://congchung7.com/upload/file/99807918705.pdfIn PDF document text
- http://www.alfapilates.pl/upload/file/78222852941.pdfIn PDF document text
- http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613d63b7e5f11---sadujavozexosolat.pdfIn PDF document text
- https://www.groupe-coelho.fr/ckfinder/userfiles/files/sopimodexupe.pdfIn PDF document text
- https://basalyemek.com/ckfinder/userfiles/files/80802797082.pdfIn PDF document text
- http://csc0311.com/userfiles/file/20210910004703_klhl6l.pdfIn PDF document text
- https://eliteplacementagency.com/uploads/files/pivexizadatunizored.pdfIn PDF document text
- http://retrievers.su/ckfinder/userfiles/files/xasatelesodudafo.pdfIn PDF document text
- http://kirsanov-maslo.ru/uploads/rixoxul.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=err_cache_miss+android+appPDF 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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000b341.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB341	16104 bytes
SHA-256: `4204f4a647e3e8488fc3125e36d68471fcc515b787f7ef36a685bb1e406e82a7`
`font_01_sfnt_off0000c88d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC88D	10652 bytes
SHA-256: `e699a5e0d5c71617bd460e95b6069e2d6807efdf396bf76d9753e5eca1ab6487`
`font_02_sfnt_off0000e0b2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE0B2	20572 bytes
SHA-256: `91c6bb588a06e98ac61cd43c8442e0a6cd8a635ad0cc185f2d16c92515409d04`
`font_03_sfnt_off00011443.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11443	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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