PDF malware analysis — malicious · 5ce13cc0d2dfd69e

MALICIOUS

PDF

79.9 KB Created: 2021-03-13 17:52:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23

MD5: bda7f5bc5c97b31a75b4e322e76c9c25 SHA-1: 2b11b4cc439b69148728a99348a248be8c5ca663 SHA-256: 5ce13cc0d2dfd69e9215546e909d9f129bdc4e5a68cd7a6b71d08c2e3b55642f

126 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with at least one, https://midufefew.ru/123?utm_term=guidebooks+6th+grade, being hosted on disposable infrastructure and likely serving as a lure. The document body, though heavily obfuscated, suggests a deceptive pretext related to educational materials.

Machine Learning

Nyx PDF Classifier malicious score 0.9995

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://midufefew.ru/123?utm_term=guidebooks+6th+grade PDF link annotation
- http://rufamegepijuwo.22web.org/rifidogo.pdfIn PDF document text
- https://cdn.sqhk.co/dudugetogi/ggce6tY/61174667647.pdfIn PDF document text
- https://cdn.sqhk.co/velabolo/eMAjeie/facts_school_code.pdfIn PDF document text
- http://tularobumof.66ghz.com/xoxixetopikewixetija.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4418170/normal_5fdfd9810f086.pdfIn PDF document text
- https://cdn.sqhk.co/fukonovum/4Ogifjj/r_type_3_snes_cheat_codes.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4417413/normal_600a1970969e7.pdfIn PDF document text
- http://pedaropira.22web.org/diary_of_a_wimpy_kid_rodrick_rules_book_cover.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4390366/normal_5ff8d8d112624.pdfIn PDF document text
- https://cdn.sqhk.co/wazafepel/ubifOih/wyze_camera_v2.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://zixagoku.rf.gd/19225439288.pdfIn PDF document text
- https://367e539a-c541-4439-991c-4bf2bef2aa7a.filesusr.com/ugd/77d535_e30554644f5d4a619f58d7c7258351d1.pdf?index=trueIn PDF document text
- https://0dd4521b-3e41-4083-9bcc-807cce03ae78.filesusr.com/ugd/cfe2e9_042d1d49e422421fa280314fe8741f8b.pdf?index=trueIn PDF document text
- https://5e1449e8-5ae4-4a15-bc7a-ee23795bc964.filesusr.com/ugd/3a34a5_4a9c969d63bf43b8a15ce48f16c173a8.pdf?index=trueIn PDF document text
- https://s3.amazonaws.com/selivuvumepaveb/93702803447.pdfIn PDF document text
- https://9042e326-c85f-44e6-b9b6-0c206471fdba.filesusr.com/ugd/0d2fda_d4b243a09cfb46eab075614d752c5630.pdf?index=trueIn PDF document text
- https://a001dc82-f31e-4944-9b76-0a8e602b6855.filesusr.com/ugd/e4ee87_b18e6cb311614a04b089ae1693ff750c.pdf?index=trueIn PDF document text
- https://s3.amazonaws.com/fezenur/checkout_form_in_bootstrap_4.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/024add7f-dfd3-4e32-96e8-915c327e73cd/depisejab.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/c2721bef-f4ed-4ac8-a286-6c56824d336f/the_house_with_a_clock_in_its_walls_book_review.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/9740e3ff-aeee-479c-b5d1-05920f9f05fa/zazuparesidum.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/2bd3d4c6-78f9-4aaa-8c03-fb9bff4c8ac9/xifotunezef.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_off0000ec81.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEC81	5220 bytes
SHA-256: `cf948e90cb3a51552295eaf9b05d9c4dd710a1a0be361d3a0f7ab6f1016326d8`
`font_01_sfnt_off0000fe55.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFE55	10712 bytes
SHA-256: `4a633432049e730f1aca0989e7d491d13e17353f58d207f499d5afea9498fe3b`
`font_02_sfnt_off000122fa.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x122FA	4324 bytes
SHA-256: `4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3`

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