PDF malware analysis — malicious · b7a8bba99eabffda

MALICIOUS

PDF

79.8 KB Created: 2021-10-04 15:00:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27

MD5: 856d69691f3a12619d021181a4ebe14f SHA-1: 25ec41522d9e6fc86b400a7be12c415751cd55b8 SHA-256: b7a8bba99eabffda019d5ad39ef097cd42bec67526bae28a0feae1d7d52f8f04

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains embedded JavaScript and numerous external URIs, many pointing to disposable domains, suggesting a link farm or SEO manipulation tactic. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a strategy to distribute many links across various hosts. The embedded JavaScript likely serves to obfuscate the malicious intent or redirect the user to malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9953

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.
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://police8coop.com/UserFiles/file/44233039371.pdf In PDF document text
- https://gifarlcm.com/upfiles/editor/files/35080912542.pdfIn PDF document text
- http://www.binghan.my/userfiles/file/21689453944.pdfIn PDF document text
- https://mimpisiluman.com/contents/files/40259912218.pdfIn PDF document text
- http://vino-charlie.cz/userfiles/file/kijafe.pdfIn PDF document text
- https://agroadvanced.com/app/webroot/newsletters/editor/files/15413669074.pdfIn PDF document text
- https://kalafiber.com/webroot/js/ckfinder/userfiles/files/22362677089.pdfIn PDF document text
- https://volandovia.it/public/fileeditor/file/muvenafi.pdfIn PDF document text
- http://donghobaoan.com/uploads/files/63118712514.pdfIn PDF document text
- http://ubestsports.com/imager/files/20210915204729.pdfIn PDF document text
- https://www.nhabe.com.vn/ckfinder/userfiles/files/63708174212.pdfIn PDF document text
- http://czdashan.cn/uploadfile/file/2021091419012673499.pdfIn PDF document text
- http://asupuro.com/upload/save_image/files/60384351166.pdfIn PDF document text
- http://kant21.com/userData/board/file/20449340403.pdfIn PDF document text
- http://stavo-bazar.cz/userfiles/file/33912883535.pdfIn PDF document text
- https://viceda.com/userfiles/file/debulilopepefodokudufuna.pdfIn PDF document text
- http://bagiez.de/userfiles/file/99211989983.pdfIn PDF document text
- https://tvmreza.tv/ckfinder/userfiles/files/57601236937.pdfIn PDF document text
- http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/16158766304b16---ludirefokizufulen.pdfIn PDF document text
- http://agilesolutions.in/uploads/92381530697.pdfIn PDF document text
- http://kirilmazbardak.com/userfiles/file/73971216177.pdfIn PDF document text
- http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/161580187002c0---4489588772.pdfIn PDF document text
- http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/65238576261493caee5b5c.pdfIn PDF document text
- https://matrainagycsalados.hu/userfiles/file/69895930209.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=losing+smell+with+sinus+infectionPDF 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_off0000d4b2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD4B2	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000ecc9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xECC9	10664 bytes
SHA-256: `39e13306fe17776f8714a383a22358c9d95f4c9101f0a1973b67ff64a8fda84d`
`font_02_sfnt_off00010510.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10510	17716 bytes
SHA-256: `56d81e738d2682f8a68ae954df230b0696fa2b374a78aff1ed2d813a5fe07e34`

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