PDF malware analysis — malicious · c87df9a35be96bad

MALICIOUS

PDF

86.4 KB Created: 2021-04-08 00:45:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10

MD5: c724e4910054ee270078130f74e4897e SHA-1: aadddecb1d06fa1e8ad7c6b084522d688786fb0a SHA-256: c87df9a35be96bad0c8b84ebafb19f87a2cbe1aab0ad0929a8743e85de45f18b

126 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ClamAV as a phishing trojan and a machine learning model assigned a high probability of maliciousness. It contains numerous embedded URLs, many of which point to disposable domains and are likely used to redirect users to malicious sites. The document body, though heavily obfuscated, contains references to complex mathematical topics, suggesting a lure to attract users interested in such subjects.

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://ponafet.ru/123?utm_term=multiplication+of+complex+numbers+in+cartesian+form PDF link annotation
- http://ogranicbio.fun/casdon_toy_dyson_ball_vacuum_reviewsheyf9.pdfIn PDF document text
- http://maritimog.medianewsonline.com/vufiliguwem.pdfIn PDF document text
- http://dajexori.mypressonline.com/landscape_architecture_design_books.pdfIn PDF document text
- http://faxadiweruxu.22web.org/56830343577.pdfIn PDF document text
- http://digosige.mywebcommunity.org/lugazoruriro.pdfIn PDF document text
- http://dadefuxafovub.22web.org/pewojesofifokira.pdfIn PDF document text
- http://zuvels.xyz/sozivozavorijegapipaxnulff.pdfIn PDF document text
- http://heretythere.site/ccent_icnd1_study_guideyian8.pdfIn PDF document text
- http://motarojetox.sportsontheweb.net/zijog.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
- http://www.daltonmaag.com/In PDF document text
- http://jufofokisib.epizy.com/21699077597.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/187652ac-f6a2-4c6e-bbb2-6efec80912f5/2018_toyota_camry_hybrid_xle_for_sale.pdfIn PDF document text
- http://kifilexaxinazer.epizy.com/can_i_download_minecraft_windows_10_for_free.pdfIn PDF document text
- https://s3.amazonaws.com/viwoxuz/88439423218.pdfIn PDF document text
- http://ruzizasasasami.rf.gd/what_fruits_can_help_you_lose_belly_fat.pdfIn PDF document text
- https://s3.amazonaws.com/bufipevuril/affinity_health_product_guide.pdfIn PDF document text
- http://livirava.atwebpages.com/toro_22_inch_recycler_lawn_mower_parts.pdfIn PDF document text
- https://s3.amazonaws.com/rubidokezive/how_to_find_income_summary.pdfIn PDF document text
- https://s3.amazonaws.com/jewizopukuni/zilabopidewelimin.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/e1fb961c-0687-433b-8e44-7ad0c7613f21/lasujen.pdfIn PDF document text
- http://namopidud.epizy.com/bagusofuxebomowanoso.pdfIn PDF document text
- https://s3.amazonaws.com/gewisetug/printf_date_format_bash.pdfIn PDF document text
- http://viposesarob.rf.gd/auckland_suburbs_map.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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000efa9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEFA9	5256 bytes
SHA-256: `6c03a1d690d003117cd09fc96895c75c5e1794f221107ebdb07bc0ac7b3813f1`
`font_01_sfnt_off0001016f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1016F	11604 bytes
SHA-256: `044deab0b38b0033d3584ce7a3d3dce25990a58a6d90ef2e91ebf3f260c1ee9e`
`font_02_sfnt_off000128b7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x128B7	16072 bytes
SHA-256: `24c5c481937acf4f4841e6563a6d7a18cfdb810806c94b09ac0ff4033348c1e6`
`font_03_sfnt_off00013d56.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13D56	4324 bytes
SHA-256: `1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361`

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