PDF malware analysis — malicious · 9a8f8d959c14128f

MALICIOUS

PDF

106.5 KB Created: 2021-04-04 02:36:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22

MD5: e24ec8b36d61a0a7ee41e384440cc147 SHA-1: 2c6964afe24972e1b7f478c67d120b96855e74bd SHA-256: 9a8f8d959c14128f736f43955b12b3771d28ca6d969b70dc6489635c4f41a60d

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses an urgency-based lure. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

Nyx PDF Classifier malicious score 0.9992

Heuristics 6

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.
Urgency / deadline lure low SE_URGENCY_LURE

Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
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://fokemale.ru/123?utm_term=chronic+kidney+disease+nice+guidelines+management PDF link annotation
- https://cdn-cms.f-static.net/uploads/4504839/normal_602c5f84e6573.pdfIn PDF document text
- https://cdn.sqhk.co/dudumadopole/jeHhiia/word_finding_game_online.pdfIn PDF document text
- https://cdn.sqhk.co/mevutaxisut/jhhjNgf/60644421450.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4481825/normal_6027cf475db78.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4458412/normal_601dfbae6ba5b.pdfIn PDF document text
- https://cdn.sqhk.co/setuboluraje/gRCgiRf/truth_or_dare_2018.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4463551/normal_602225f512366.pdfIn PDF document text
- https://cdn.sqhk.co/jorafulati/bSjdidD/english_to_japanese_romaji_translation_with_pronunciation.pdfIn PDF document text
- http://nout-sale.site/vuvod4k002.pdfIn PDF document text
- http://rodina38.ru/band_vaaje_mp3_songs_free_downloadnt0rm.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4393488/normal_6035090359501.pdfIn PDF document text
- http://kexopef.iblogger.org/89740175699.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4493282/normal_5fd0b506d3d11.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/ropuba/rinijetutisetojof.pdfIn PDF document text
- https://s3.amazonaws.com/kiguteperilodu/torulebusetajuwamewuxuwez.pdfIn PDF document text
- http://josetevuj.epizy.com/13118728880.pdfIn PDF document text
- https://s3.amazonaws.com/vavapekadoliti/what_financial_questions_to_ask_before_marriage.pdfIn PDF document text
- http://javewexo.epizy.com/koparenekugexo.pdfIn PDF document text
- http://posufimiru.rf.gd/bsmrstu_admission_circular_2020_19_download.pdfIn PDF document text
- http://putiremupupunis.epizy.com/personal_statement_law_school_template.pdfIn PDF document text
- https://s3.amazonaws.com/womirofop/what_is_the_focus_of_christianity.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_off00014224.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x14224	5424 bytes
SHA-256: `b1d8863f961af824851e187efb6bac8fb93c81820fbf3e5a8785a64d85bdee34`
`font_01_sfnt_off00015471.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x15471	10688 bytes
SHA-256: `6bdbcff2b8fb6900072f9644db2e3a14ace7628ac46afca309defee903e88a42`
`font_02_sfnt_off00017939.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x17939	16060 bytes
SHA-256: `2173a1880e9f774f759393e7d0d28dda91d04d8a3eae6bea41b822770b343b90`
`font_03_sfnt_off00018dd0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x18DD0	4324 bytes
SHA-256: `4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3`

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