PDF malware analysis — malicious · b4418c17c4ce2a9c

MALICIOUS

PDF

133.0 KB Created: 2021-03-12 10:03:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25

MD5: c6fd5afd9c5c41fa3d8ba089ebea97e1 SHA-1: d99e6c1a51ce86f03ae49588b51f4bc96123f96e SHA-256: b4418c17c4ce2a9c3feed2cc687606f59bc9957fc04630bd00eaddbbed5b1a2f

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are associated with phishing lures, as indicated by the 'SE_INVOICE_LURE' heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to trick users into downloading malware. The presence of external URIs and the link farm heuristic indicate a phishing or credential harvesting attempt.

Machine Learning

Nyx PDF Classifier malicious score 0.9994

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.
Fake invoice / payment lure low SE_INVOICE_LURE

Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
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://dugedepap.ru/award?keyword=manual+de+auditoria+informatica+pdf PDF link annotation
- http://alcozerox.com/32067116244en1oy.pdfIn PDF document text
- http://ctuxuu.com/993009803876uvpm.pdfIn PDF document text
- http://itclick.pro/tatowelogumoxaar8nc.pdfIn PDF document text
- http://hdvideo.design/guzanug8y08g.pdfIn PDF document text
- http://bluebadge-support.com/36101641954z2ids.pdfIn PDF document text
- http://tabikola.online/5920853045417xso.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4460983/normal_604a76288ce3b.pdfIn PDF document text
- http://gixodugesu.medianewsonline.com/pudogek.pdfIn PDF document text
- http://ninotekega.mygamesonline.org/how_do_you_calculate_extra_credit_into_your_grade.pdfIn PDF document text
- http://mebelintera.ru/nursing_informatics_and_the_foundatium22p.pdfIn PDF document text
- http://carluxepaint.site/184489371589sc7.pdfIn PDF document text
- http://reduslim-siteofficial.site/black_lion_claim_ticket_scrapik3wi.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4385214/normal_602d6f074033f.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/nutanigonu/exploration_merit_badge_powerpoint.pdfIn PDF document text
- https://a1c9bafd-2917-4c1b-b79c-a4b44a941470.filesusr.com/ugd/f0f215_f99142cda5b54396b46d83a3e3767690.pdf?index=trueIn PDF document text
- https://cb0920a4-0dfc-4587-8161-bd3bf883b043.filesusr.com/ugd/df391a_9611e2b3e8ec4c8984e5935c4f83ff9c.pdf?index=trueIn PDF document text
- https://7a3463bf-3117-47cc-940f-ad9d50d05675.filesusr.com/ugd/9f2514_ed00ae4cffa949158f6c862e6c1afe04.pdf?index=trueIn PDF document text
- https://s3.amazonaws.com/vigevot/inline_cascading_style_sheets_css.pdfIn PDF document text
- https://b5f169ef-6bcf-4d19-a24b-32bdc9dd7a5f.filesusr.com/ugd/2e79a6_8b2fbb7f076d42c19b10e24f31b95c2e.pdf?index=trueIn PDF document text
- https://a32e93c2-1aa3-4149-af29-aa5d163ab988.filesusr.com/ugd/40336e_79567ea74c4a4df6ab4d2e1836aa80b6.pdf?index=trueIn PDF document text
- https://s3.amazonaws.com/sugowubuf/chosen_hill_school_new_uniform.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_off0001b96f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1B96F	5008 bytes
SHA-256: `d264cd09d0a62ed6fe3803b33cfad29574b2616a2a86cefe9800e0299e92604a`
`font_01_sfnt_off0001ca5f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1CA5F	14592 bytes
SHA-256: `2d3b25a6529e5861a8e43c24ac66d61a52dd0a4adfae1582e715d0c8b8ef356f`
`font_02_sfnt_off0001f81f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1F81F	4324 bytes
SHA-256: `05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176`

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