PDF malware analysis — malicious · 3fa855a9c5c0f44b

MALICIOUS

PDF

81.2 KB Created: 2021-03-10 00:54:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17

MD5: 04ddd14639c5f0c57ebc0eacca2ccfe3 SHA-1: c6b85a9905f6943047cf2f3d70cd2d0021654a43 SHA-256: 3fa855a9c5c0f44b68d9ad7a0dec74ab823acc05160ae27cc060805b78e65d03

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URLs, many of which are hosted on disposable domains, suggesting a link farm or phishing infrastructure. The presence of a 'download button' heuristic further supports a lure-based attack pattern.

Machine Learning

Nyx PDF Classifier malicious score 0.9997

Heuristics 6

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.
Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON

Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
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://pelibifir.ru/award?keyword=aiag+spc+manual+latest+edition+pdf PDF link annotation
- http://espaceabonnes.com/sonubopisiwefilotegozwq24x.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4368467/normal_5ff7caf929a0e.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4413368/normal_602345715b181.pdfIn PDF document text
- http://help-copyrightviolationhelpcenter.com/lafusemosegofobusezetm9o3o.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4459776/normal_5fddf80a3a803.pdfIn PDF document text
- http://tublitalia.fun/92776248383hjfuq.pdfIn PDF document text
- http://rgtuitp.ru/amtrak_illinois_zephyr_schedule2bu68.pdfIn PDF document text
- http://josibazuveloj.iblogger.org/56463880074.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4463262/normal_6036826a24772.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4458412/normal_5ff1ca43e0f75.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
- http://smc.org.in)MeeraRegularMeera2016SMC7.0.0+20171102HussainIn PDF document text
- http://smc.org.inhttp://smc.org.inIn PDF document text
- https://s3.amazonaws.com/winumigutam/banana_games_redux_free.pdfIn PDF document text
- https://2e5cbe44-7de3-4e3f-b94c-8a8567814465.filesusr.com/ugd/f96b02_6b929513578447ad9fdab69777f0a967.pdf?index=trueIn PDF document text
- http://wamitut.epizy.com/7481229209.pdfIn PDF document text
- http://kazowaz.rf.gd/netflix_apk_para_pc_uptodown.pdfIn PDF document text
- https://8eefcaf3-52f5-4123-8be5-b1f0aaeea45e.filesusr.com/ugd/1d3654_02b453b2e91a4571a0bad1dc1b17d796.pdf?index=trueIn PDF document text
- https://3dcfbd4a-ef33-49dc-a04a-0aaf5307c30d.filesusr.com/ugd/b47706_445ebef7223547daa324d28e50150be9.pdf?index=trueIn PDF document text
- https://s3.amazonaws.com/patotale/2127456055.pdfIn PDF document text
- https://e8e87dc5-637d-47ba-9de6-e7d98d123d78.filesusr.com/ugd/a69a03_8ace7d80c33e4c35af9e5a911de76685.pdf?index=trueIn PDF document text
- http://vikaviruvumuz.epizy.com/anova_table.pdfIn PDF document text
- https://s3.amazonaws.com/tazopaju/how_to_hook_up_a_dvd_vcr_combo_player_to_a_smart_tv.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
- https://gitlab.com/smc/meera/blob/master/COPYINGIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000f357.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF357	5368 bytes
SHA-256: `a73edb52619a2732b4d00cb9cdca012052c0456d172cfe6dfa048f22c548826d`
`font_01_sfnt_off0001058c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1058C	3696 bytes
SHA-256: `88f997d22ac5eaf4d90d8773221f86ee5f179d0afc59f4daa2689debbb92fbf8`
`font_02_sfnt_off000113d5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x113D5	10240 bytes
SHA-256: `b137273d0e000e2d7dc28e5fe0f14df70ee1e661b2ed833e9308b270c974bc41`

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