PDF malware analysis — malicious · 733125372a2b74ef

MALICIOUS

PDF

77.5 KB Created: 2021-02-11 16:07:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 53f84c7141e3f7804a66d83af8b22504 SHA-1: 6387787e8161315f6e864e912c3be3e15c00f8ed SHA-256: 733125372a2b74ef4475e6c582b13146190290cbbb0173201e44b86d477ce5de

96 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is a PDF document identified as malicious by ML classifiers and ClamAV. It contains an embedded URI pointing to 'druttle.ru', which is likely part of a phishing or malware distribution scheme. The document body, though heavily obfuscated, suggests a lure related to 'spectroscopy problem set answers'. No scripts were extracted, but the presence of embedded URIs and the ML detection strongly indicate a malicious intent to redirect the user to a harmful 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://druttle.ru/wix?keyword=ir+ms+uv+nmr+spectroscopy+problem+set+answers
- https://static.s123-cdn-static.com/uploads/4460950/normal_5ffc674e7732c.pdf
- https://cdn-cms.f-static.net/uploads/4415534/normal_600adaf227910.pdf
- https://static.s123-cdn-static.com/uploads/4470222/normal_6009998493000.pdf
- https://static.s123-cdn-static.com/uploads/4481056/normal_5fcc2b6267893.pdf
- https://cdn-cms.f-static.net/uploads/4428038/normal_6019ae6b2b16f.pdf
- https://cdn-cms.f-static.net/uploads/4420610/normal_6019335fea561.pdf
- https://cdn-cms.f-static.net/uploads/4393904/normal_60105f782c65b.pdf
- http://www.ascendercorp.com/
- http://www.ascendercorp.com/typedesigners.html
- https://s3.amazonaws.com/firigugixujotov/befakesonijogane.pdf
- https://s3.amazonaws.com/mefovu/zubolabeparalovomeroka.pdf
- https://s3.amazonaws.com/zufojadibi/arcee_transformer_toy.pdf
- https://s3.amazonaws.com/lakadutof/javascript_interview_questions_and_answers_2019.pdf
- https://s3.amazonaws.com/nawuvud/amazon_prime_films_to_laptop.pdf
- https://s3.amazonaws.com/jovekus/sisinetom.pdf
- https://s3.amazonaws.com/susonanezaj/36393952678.pdf
- https://s3.amazonaws.com/suzujewa/google_chrome_extension_json_formatter.pdf
- https://s3.amazonaws.com/wobuzisibal/50013207486.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_off0000eee6.bin` `68fe772ce1e25873a3095791a5d0c7a748e50422730fde11eff6445aa932a042`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEEE6	5408 bytes
`font_01_sfnt_off0001014c.bin` `aa14aa1e4db8b2a135c5ee9571c0949b89e89919c98b4713bb803b16a4f76403`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1014C	12344 bytes

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