PDF malware analysis — malicious · c8abe23f9eb9ec06

MALICIOUS

PDF

79.2 KB Created: 2021-04-04 10:05:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29

MD5: 131b26f1e1996c07f855a3b694442371 SHA-1: ead5f444923973f0af319a303947278f484a7dff SHA-256: c8abe23f9eb9ec06158670dcfc11ee30358981d141fed767f9eb0485dde3c865

126 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or redirection mechanism to malicious sites. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to manipulate search engine results or distribute malware via seemingly legitimate links. No scripts were extracted, but the overall structure and heuristics point to a phishing or malware distribution attempt.

Machine Learning

Nyx PDF Classifier malicious score 0.9995

Heuristics 5

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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://druttle.ru/award?keyword=alligation+math+pdf PDF link annotation
- http://womizepivilora.sportsontheweb.net/bapetemanixe.pdfIn PDF document text
- http://xuxetosufuzo.getenjoyment.net/mosajeforefojum.pdfIn PDF document text
- http://bunowefutop.22web.org/perfect_english_grammar_past_continuous_exercise.pdfIn PDF document text
- http://wifivapi.iblogger.org/85589406987.pdfIn PDF document text
- http://zaxevef.getenjoyment.net/39750372375.pdfIn PDF document text
- http://lagukuburen.iblogger.org/maytag_quiet_series_200_dishwasher_control_panel.pdfIn PDF document text
- http://lipexifinidoda.scienceontheweb.net/nogudalamutuvasowozasaba.pdfIn PDF document text
- http://majelogajizivo.iblogger.org/rebunenebuxodufezazemesaw.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://fuvarijes.atwebpages.com/61004789344.pdfIn PDF document text
- http://dalufiba.rf.gd/legexan.pdfIn PDF document text
- http://wixevudu.epizy.com/endometrial_hyperplasia_guidelines.pdfIn PDF document text
- https://c4a5d104-04f9-44e6-b03f-1f5edac3680f.filesusr.com/ugd/f23921_d8ee9ec4ecb243b38da28d9d1ea53250.pdf?index=trueIn PDF document text
- https://uploads.strikinglycdn.com/files/aec78c11-cadf-473a-ba98-70c9f43c9d3f/nituvusuz.pdfIn PDF document text
- https://8d928d4c-4e32-4dc6-8093-d383c90b3cca.filesusr.com/ugd/b5d49c_fc06472ad8594154a44ade2060d104fe.pdf?index=trueIn PDF document text
- https://uploads.strikinglycdn.com/files/595068c7-5812-4669-88de-5122cd2b9ac3/what_is_a_chartered_financial_analyst_cfa.pdfIn PDF document text
- https://s3.amazonaws.com/mozirolinitaje/android_studio_button_text_color.pdfIn PDF document text
- http://takikixak.rf.gd/34851415922.pdfIn PDF document text
- https://8ac5c8e1-9174-427d-95c2-90bebb9f105a.filesusr.com/ugd/44b221_e9c7f5dcc31a469eb0175cbf0e1ff8a3.pdf?index=trueIn PDF document text
- http://jewegiseku.epizy.com/tejikugaj.pdfIn PDF document text
- http://xegilejefaga.epizy.com/dell_r440_server_manual.pdfIn PDF document text
- https://s3.amazonaws.com/gifiz/wuzujirufuborukojilarise.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/1be904f8-2049-48ae-be79-391cf2726c36/best_robot_vacuum_consumer_report.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_off0000e8f0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE8F0	4840 bytes
SHA-256: `13cdda3e459eaf0a34ac9302017771938e7d3936d425fbc06816d040295390ae`
`font_01_sfnt_off0000f92e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF92E	11828 bytes
SHA-256: `3aeac1328e5997c75b7d86b6b9e77873d1db9b6fd4c2a659dc7768709f3aacb3`
`font_02_sfnt_off00012172.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12172	4324 bytes
SHA-256: `b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c`

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