PDF malware analysis — malicious · be75f5b19dcac322

MALICIOUS

PDF

83.0 KB Created: 2021-09-15 15:55:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 0aa31c6a53a35ec7d2cdf0af549c1ab2 SHA-1: d896c5c5f349a7725c5083399b9336abfec9e610 SHA-256: be75f5b19dcac322a72fcb16b6417011ba7e19b239f21c72d494123e2ba97f12

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. The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, a common tactic for phishing or distributing further malware. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, suggesting the PDF's primary purpose is to redirect users through a chain of links.

Machine Learning

Nyx PDF Classifier malicious score 0.9964

Heuristics 5

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.
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://archism.ru/uplcv?utm_term=gta+3+on+ps5 PDF link annotation
- http://vititanon.com/user_img/files/65995301144.pdfIn PDF document text
- https://www.opsclown.it/ckfinder/userfiles/files/43274022856.pdfIn PDF document text
- http://dejede.com/userfiles/file/48839366365.pdfIn PDF document text
- http://xn--tnqz8hz5cb8l.com/upload/files/vuzolajidasavulabutilot.pdfIn PDF document text
- http://antitumor.org/filespath/files/20210901232151.pdfIn PDF document text
- http://handbook.hu/upload/page/file/17222792118.pdfIn PDF document text
- https://communeouchamps.fr/userfiles/file/pujopul.pdfIn PDF document text
- http://thcscatquea.hoaiduc.edu.vn/ckfinder/userfiles/files/95357671323.pdfIn PDF document text
- http://inarchengineering.it/userfiles/files/64543524694.pdfIn PDF document text
- http://masterref.ru/editorfiles/file/47629399614.pdfIn PDF document text
- https://campermagazine.tv/public/file/dexekexetepunimer.pdfIn PDF document text
- https://billionbosses.com/ckfinder/userfiles/files/vejolirenim.pdfIn PDF document text
- http://www.cda.org.hk/ckfinder/userfiles/files/8065022980.pdfIn PDF document text
- https://www.ruchya.com.tw/upload/files/53422248222.pdfIn PDF document text
- http://wonikquartz.com/upload/editor/file/1630588442.pdfIn PDF document text
- http://farmina.ru/uploads/files/26276294218.pdfIn PDF document text
- https://pilot-nav.socksnbows.com/ckfinder/userfiles/files/5998702415.pdfIn PDF document text
- https://zenithoverseas.com/assets/userfiles/files/24143950064.pdfIn PDF document text
- https://menokatea.com/ckfinder/userfiles/files/12797327539.pdfIn PDF document text
- https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/nppcdoaqlk80n9ni5rt5d2i83r/libomex.pdfIn PDF document text
- http://usaoxin.com/userfiles/2021-9/file/finekiforudowobazu.pdfIn PDF document text
- http://xn----8sbaqfskngn1qi.xn--p1ai/userfiles/file/jiror.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_off0000ddd3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDDD3	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000f5e5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF5E5	19020 bytes
SHA-256: `cf0279db3bbf7d9e448327b951567b530eccb654e86682aa8ce32f828a9b49ca`
`font_02_sfnt_off000127ea.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x127EA	10220 bytes
SHA-256: `ebe69b1184da36dc3588d6bd438f48897e9609f630bf242a2796140d8420eeb8`

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