PDF malware analysis — malicious · 941d566255b01686

MALICIOUS

PDF

71.5 KB Created: 2021-01-12 08:50:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16

MD5: 42cafa4540223526e52012072652f75c SHA-1: c600177b6833ed823c65a0cf6324970780d7e834 SHA-256: 941d566255b01686b94bca2fb9ce5dc403051ed1d2af55d4da2d8935b0e6aeef

96 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is a PDF containing an embedded URL that points to a suspicious domain, flagged by heuristics as potentially malicious and identified by ClamAV as a phishing trojan. The ML classifier also strongly indicated maliciousness. The presence of an external URI and the overall detection suggest an attempt to redirect the user to a malicious site, likely for phishing or to download further payloads.

Machine Learning

Nyx PDF Classifier malicious score 0.9998

Heuristics 4

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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://traffnew.ru/123?utm_term=deterministic+environment+definition PDF link annotation
- https://cdn-cms.f-static.net/uploads/4470389/normal_5fbf33e7d5005.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4409623/normal_5fa5d5f76cf0a.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4370266/normal_5fc19ed7aaf0a.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4408864/normal_5f9d259af0f16.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4391315/normal_5fa22d4814a70.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4391903/normal_5fb48bf524111.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4529281/normal_5fbc89986e339.pdfIn PDF document text
- https://site-1168079.mozfiles.com/files/1168079/85633176821.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
- https://s3.amazonaws.com/sinadi/english_listening_audio_free.pdfIn PDF document text
- https://s3.amazonaws.com/xeropizuwe/chairman_job_description.pdfIn PDF document text
- https://s3.amazonaws.com/dazinibonofobi/62598959506.pdfIn PDF document text
- https://s3.amazonaws.com/mamibis/ada_guidelines_2018_espaol.pdfIn PDF document text
- https://s3.amazonaws.com/wibedubosateg/civil_engineering_building_construction_report.pdfIn PDF document text
- https://s3.amazonaws.com/mudurixo/latuwudomeferiwizevobed.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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000dd99.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDD99	4984 bytes
SHA-256: `e8924bf638f9beb0c192b0d27962e4af7739c32b4f454a6cbca65e64fab91ec6`
`font_01_sfnt_off0000ee8a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEE8A	10176 bytes
SHA-256: `5c1b16a6841509c121c186b056f900faa2fe7604c7313fc44bafb57e376bf833`

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