PDF malware analysis — malicious · 3bb4f297eed7b2f0

MALICIOUS

PDF

87.2 KB Created: 2021-03-29 14:40:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16

MD5: bbc0e677ea55db35f625a3bd421b4e59 SHA-1: b91818b4e263e8b82b5dc4e7e451fd2e6dedc68e SHA-256: 3bb4f297eed7b2f095b5c70c19475452cf72a07014cfd03e724ceca88db06aa6

126 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers. It contains numerous external URLs, with one specifically pointing to 'xajibur.ru/strik', suggesting a phishing or malware distribution attempt. The document body, though heavily obfuscated, references 'Python learning resources pdf github', likely a lure to entice users to click on the embedded malicious links.

Machine Learning

Nyx PDF Classifier malicious score 0.9991

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://xajibur.ru/strik?utm_term=python+learning+resources+pdf+github PDF link annotation
- http://nncucuucuc.space/dhcp_option_82_ciscodlttq.pdfIn PDF document text
- http://budivev.scienceontheweb.net/pamidabifigu.pdfIn PDF document text
- https://cdn.sqhk.co/vomisape/gjffGcx/15698745815.pdfIn PDF document text
- http://esclub.pro/95847990343s3ibj.pdfIn PDF document text
- http://nakanilo.club/23195370305myb69.pdfIn PDF document text
- http://sayfelengs.space/diamond_aircraft_parts_manual4uq7l.pdfIn PDF document text
- https://cdn.sqhk.co/kutupejotige/ggFSHAq/grama_sachivalayam_answer_key_paper.pdfIn PDF document text
- http://repizedozoful.sportsontheweb.net/61874754650.pdfIn PDF document text
- https://cdn.sqhk.co/wixexozesila/dqSif65/advance_auto_parts_battery_terminal.pdfIn PDF document text
- https://cdn.sqhk.co/birenejar/thglher/45608218933.pdfIn PDF document text
- http://lojapidabud.mypressonline.com/bauhaus_school_architecture.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
- https://62abf401-5fc9-4991-ac00-cb6a0c8cf8ec.filesusr.com/ugd/e4ff69_0cd61f43efdf40788e051d839e0cc7d8.pdf?index=trueIn PDF document text
- https://s3.amazonaws.com/sesafefanulokam/penumutozetefiwexilu.pdfIn PDF document text
- https://203e7bc3-08d7-4ecc-a8df-f797e0d4a079.filesusr.com/ugd/d4579c_7ef702201a194101a0cb97b765701fc6.pdf?index=trueIn PDF document text
- http://milebulijulami.onlinewebshop.net/la_repblica_de_platn_editorial_eudeba.pdfIn PDF document text
- https://7e6b698e-d56f-4a21-8c48-787e2f6d39f4.filesusr.com/ugd/7836c9_f741f46cf9b849c5a12fdd064b6435bb.pdf?index=trueIn PDF document text
- https://s3.amazonaws.com/najubu/rubajekusimesa.pdfIn PDF document text
- https://s3.amazonaws.com/lebaxa/gage_r_r_analysis_report.pdfIn PDF document text
- https://s3.amazonaws.com/nuxulikiwab/what_are_the_4_types_of_database.pdfIn PDF document text
- https://6f1239e7-da96-47bf-8adb-22d47a96a9da.filesusr.com/ugd/bb5a15_0037a7774e17419e877e3fa47b14c252.pdf?index=trueIn PDF document text
- http://noroved.myartsonline.com/adjetivos_en_ingles_para_nios.pdfIn PDF document text
- https://85fc0914-20e3-4f1c-be8c-de7e6f89f47e.filesusr.com/ugd/a44510_108cb812900c436b929e36effeb6c755.pdf?index=trueIn PDF document text
- https://s3.amazonaws.com/verirejon/template_layer_illustrator.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://scripts.sil.org/OFLIn 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_off0000ff3c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFF3C	5660 bytes
SHA-256: `8134ac72578c5fe49edd25b528825b2ecd1cf59da5b02b0274094ff25a31641b`
`font_01_sfnt_off00011280.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11280	11644 bytes
SHA-256: `641bb4d1f92fb7429611e293de94fcc78b8d0212168e2d9fe84636604f7faeca`
`font_02_sfnt_off000139aa.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x139AA	16204 bytes
SHA-256: `a95eff378c135b1ab40d10b3cd1da1bafbc07f86005f57898d079c90d712ddbd`

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