PDF malware analysis — malicious · d50e4d5c9b833647

MALICIOUS

PDF

84.5 KB Created: 2021-09-09 11:57:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22

MD5: 971646ffbb2a8d43f16c8cb1357037dd SHA-1: b90583444614fecdfbab0c5a65fdee19eae8e7f7 SHA-256: d50e4d5c9b833647cd200833a16c308c9f2af3381f8ebd138efe8ed8e6691b9d

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and multiple external URIs, including one pointing to 'infrive.ru', suggesting it's designed to redirect users to potentially harmful websites. The PDF's structure and numerous links indicate a link farm tactic, often used for phishing or distributing further malware.

Machine Learning

Nyx PDF Classifier malicious score 0.9951

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 https://infrive.ru/uplcv?utm_term=it%27s+okay+not+to+be+okay+free+watch PDF link annotation
- http://dkstores.gr/userfiles/file/bopepufusabufezoxelonakez.pdfIn PDF document text
- http://erisalaw-chicago.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/66586692191.pdfIn PDF document text
- http://k-ookuma.com/js/upload/files/58646732532.pdfIn PDF document text
- https://alicantea.centralcms.cloud/galeria/files/12446479979.pdfIn PDF document text
- https://inprovit.com/ckfinder/userfiles/files/lagivawepeperezup.pdfIn PDF document text
- http://tongrentangthai.com/UserFiles/file/falifukixumasikut.pdfIn PDF document text
- https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16130f22c5f03f---fisogoxaj.pdfIn PDF document text
- http://musicpark-live.com/userfiles/file/vanosorerifa.pdfIn PDF document text
- http://ambvetsanprospero.eu/userfiles/files/rakudunawuj.pdfIn PDF document text
- https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/7afda4fea78db543f5c1b33f3233addf/rafabiralorosuviligatik.pdfIn PDF document text
- http://rnralpha.cz/res/file/94762829159.pdfIn PDF document text
- https://bem-sa.com/img/file/31822253067.pdfIn PDF document text
- https://kar360.com/resimler/files/57663200510.pdfIn PDF document text
- http://millecolori.it/images/file/27264738721.pdfIn PDF document text
- http://fluitec.fr/ressource/site-image/files/kutamugawupixuvenifijabe.pdfIn PDF document text
- https://yogaspotny.com/userfiles/file/72355928505.pdfIn PDF document text
- http://metamorfozyayincilik.com/userfiles/file/59089373358.pdfIn PDF document text
- https://drhuanghair.com/uploads/files/202109082229454803.pdfIn PDF document text
- http://turchifiltri.com/userfiles/files/viwesikopoba.pdfIn PDF document text
- http://abcgsgeds.friendship-match.com/upload/files/vajarobuvuraw.pdfIn PDF document text
- http://tunesistudio.eu/userfiles/files/xonuzigebebonume.pdfIn PDF document text
- http://full814.com/upload/files/21625241367.pdfIn PDF document text
- https://happycolaborativo.com/uploads/files/zenixapelelose.pdfIn PDF document text
- http://capthepcongtrinh.com/uploads/news/files/24745176442.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_off0000ded2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDED2	20372 bytes
SHA-256: `a1d82f0e0ce76602eb695d413347596a582923721e31b7c4e3f1872db0eb84b6`
`font_01_sfnt_off000113cb.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x113CB	10712 bytes
SHA-256: `e672f19a3c3927867fe41a554b6aeba05d8564c9fcb620a84a6ccd2cab1402a2`
`font_02_sfnt_off00012c97.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12C97	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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