PDF malware analysis — malicious · 1bcd046fef528ea8

MALICIOUS

PDF

73.5 KB Created: 2021-05-22 23:07:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: e526ccb78a1532b4c13888f060d9678e SHA-1: 72a870019f96ed29e9e7012574f1a2e627a9d0c6 SHA-256: 1bcd046fef528ea812eec47f3e44d2b834fd54f5152d7cd67424ad1d4d0a7133

96 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is a PDF document that contains a lure related to 'Permutation vs combination worksheet answers'. It embeds a URL pointing to 'jacksth.ru', which is flagged as malicious by heuristics and ClamAV. The ML classifier also strongly indicates maliciousness. The PDF structure and embedded content suggest a phishing attempt to redirect users to a malicious site.

Machine Learning

Nyx PDF Classifier malicious score 0.9998

Heuristics 4

ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
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://jacksth.ru/strik?utm_term=permutation+vs+combination+worksheet+answers
- https://cdn-cms.f-static.net/uploads/4380395/normal_605b8eb577315.pdf
- https://cdn-cms.f-static.net/uploads/4476010/normal_5fd5f4c92522d.pdf
- https://cdn-cms.f-static.net/uploads/4453743/normal_5fd8a0cddc783.pdf
- https://cdn-cms.f-static.net/uploads/4460477/normal_604e9bb4156ce.pdf
- https://static.s123-cdn-static.com/uploads/4417997/normal_5fc8587664282.pdf
- http://www.ascendercorp.com/
- http://www.ascendercorp.com/typedesigners.html
- https://s3.amazonaws.com/vapite/1013601587.pdf
- https://s3.amazonaws.com/wanasuvedigo/10992388530.pdf
- https://s3.amazonaws.com/xapidajovaji/hollywood_reporter_film_schools_2018.pdf
- https://s3.amazonaws.com/naxizugenabi/kumon_math_answers_level_d.pdf
- https://s3.amazonaws.com/suzixegazunow/xutuwevonosade.pdf
- https://s3.amazonaws.com/gidibesuxi/callus_formation_in_plants.pdf
- https://s3.amazonaws.com/zetituri/lufapemaxeva.pdf
- https://s3.amazonaws.com/likadojivivofu/88195557390.pdf
- https://s3.amazonaws.com/sajatesawodiji/registration_page_template_bootstrap.pdf
- https://s3.amazonaws.com/lebaxa/conjunction_worksheet_for_class_4th.pdf
- https://s3.amazonaws.com/xidulumexi/wibijelijolalovixurepi.pdf
- https://s3.amazonaws.com/kevava/wulixoxivaromega.pdf
- https://s3.amazonaws.com/nisiwanolom/gisanimowap.pdf
- https://s3.amazonaws.com/jepinebawo/fugeroli.pdf
- http://www.w3.org/1999/02/22-rdf-syntax-ns#
- http://purl.org/dc/elements/1.1/
- http://ns.adobe.com/pdf/1.3/
- http://ns.adobe.com/xap/1.0/
- http://ns.adobe.com/xap/1.0/mm/
- http://ns.adobe.com/xap/1.0/rights/
- http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000e404.bin` `3d3ec4b2ff24ad1a625f5a7c5ebd0da66cd7612471c8620b94e3082d606d1105`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE404	5364 bytes
`font_01_sfnt_off0000f62a.bin` `04282baeb6eace4050fcd437c635e19d9043c8b955a336fe1845e341c3acf9e8`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF62A	10196 bytes

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