PDF malware analysis — malicious · c25352b35dc3284e

MALICIOUS

PDF

82.0 KB Created: 2021-03-27 15:18:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23

MD5: 4f9e99ff581a3dd9d6b5e19cea5b09a1 SHA-1: 2be1981e4921c8c7a2c61a622bb43803e3d4f99d SHA-256: c25352b35dc3284ea50c7774f1578af68fa1fb815ff5c9c117afec449a3440e3

126 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous embedded URLs, many pointing to disposable hosting, and is flagged by heuristics as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9990

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://nipisod.ru/award?keyword=rsv+bible+catholic+edition+free+download+pdf PDF link annotation
- https://cdn.sqhk.co/gapalagabig/jaAotRN/88625596780.pdfIn PDF document text
- https://cdn.sqhk.co/ropobemuma/jeHGhiq/17295918190.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4447087/normal_6035c1fbec65c.pdfIn PDF document text
- http://foguwefo.iblogger.org/48174612635.pdfIn PDF document text
- http://pawezujexas.mywebcommunity.org/bixapesubebojaveviwa.pdfIn PDF document text
- https://cdn.sqhk.co/vawapisoxe/jjhahjE/collage_maker_app_free_download.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4471988/normal_6020408cdbe21.pdfIn PDF document text
- http://zawubitukete.22web.org/gta_vice_city_cheats_pc_download.pdfIn PDF document text
- https://cdn.sqhk.co/lobinazema/h5BrHF5/bulk_candy_banana_runts.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4413017/normal_6047fe6dd13dd.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4449599/normal_605ee4d0e86d7.pdfIn PDF document text
- https://cdn.sqhk.co/durotula/ghihgfd/driving_school_classics_hack_ios.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4496602/normal_605d853d8f43d.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
- https://s3.amazonaws.com/gofilafixu/altered_carbon_season_2_episode_1_song.pdfIn PDF document text
- http://perexuwofogefo.onlinewebshop.net/how_do_i_connect_my_bose_wireless_headphones_to_my_lg_smart_tv.pdfIn PDF document text
- http://sabiwilurase.atwebpages.com/tara_brach_books_in_order.pdfIn PDF document text
- http://vulawogini.rf.gd/muzidajivadumizunerado.pdfIn PDF document text
- https://a519209a-2b0a-481f-9fe9-460c873bdc80.filesusr.com/ugd/270e53_f4cc862e13834f7280ff9479596e89fe.pdf?index=trueIn PDF document text
- https://s3.amazonaws.com/julexekubaj/convert_tex_to_python.pdfIn PDF document text
- https://d668ac4b-7052-46b9-8d0c-7e282d24ced7.filesusr.com/ugd/00fc84_9cfe2b625bbc4773ad195e3568884ab6.pdf?index=trueIn PDF document text
- https://s3.amazonaws.com/bulolimepol/someone_like_you_karaoke_guide_melody.pdfIn PDF document text
- https://4b5f4e46-8b81-4257-bf39-61fc08ba57b0.filesusr.com/ugd/7ea8bb_b1ecbc4ad32649f894bc36882aa22956.pdf?index=trueIn PDF document text
- http://surafupomef.epizy.com/96831910977.pdfIn PDF document text
- https://s3.amazonaws.com/roxawo/91630969923.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000f5f6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF5F6	5332 bytes
SHA-256: `3680a2e4ceaf1c334cdcf8e6f4a0df05f236a1f83577c3fc1946952de883485f`
`font_01_sfnt_off00010812.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10812	10632 bytes
SHA-256: `61780eee87c2c46406305651165b249373e577ddd7e130a13987f7c686bbeb26`
`font_02_sfnt_off00012c44.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12C44	4324 bytes
SHA-256: `4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3`

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