PDF malware analysis — malicious · e03102338cb83647

MALICIOUS

PDF

97.2 KB Created: 2021-06-13 06:27:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25

MD5: 21f4855006ea85dbf846e270b2f149bd SHA-1: 03ac040e57cb1e6c777566675ea8550d316c842b SHA-256: e03102338cb83647ede1d3ffa0fa3fdb2194cac4bbbba7666df4be00dd9ba862

96 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is a PDF document detected as malicious by ClamAV and an ML classifier. It contains an embedded URI pointing to 'chcial.ru', which is likely a phishing or malware distribution site. The document body, though heavily obfuscated, suggests a lure related to 'equilibrium calculations worksheet answers'. No scripts were extracted, but the presence of external URLs and the nature of the detection indicate a phishing or malware delivery attempt.

Machine Learning

Nyx PDF Classifier malicious score 0.9997

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://chcial.ru/pbw?utm_term=equilibrium+calculations+worksheet+answers PDF link annotation
- https://static.s123-cdn-static.com/uploads/4382949/normal_600901bacde13.pdfIn PDF document text
- https://bifurizikekoson.weebly.com/uploads/1/3/4/6/134690439/b6367.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4366385/normal_6032122161af5.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4368782/normal_60327b9333683.pdfIn PDF document text
- https://durozuxazoxete.weebly.com/uploads/1/3/4/6/134647509/25634.pdfIn PDF document text
- https://static.s123-cdn-static-d.com/uploads/4455179/normal_60affe2bb1ed9.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4425237/normal_5fffa841599b0.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4383471/normal_5fe53d8824fa4.pdfIn PDF document text
- https://gabexilo.weebly.com/uploads/1/3/4/1/134109250/7815303.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4472764/normal_5fce43f16f3cf.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4367621/normal_6033a83b96676.pdfIn PDF document text
- https://dugumali.weebly.com/uploads/1/3/1/4/131437411/9396980.pdfIn PDF document text
- https://butafujedixixi.weebly.com/uploads/1/3/4/2/134236167/1241967.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4479224/normal_605d7ef43222e.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4403128/normal_606e5a9193dda.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
- https://uploads.strikinglycdn.com/files/a3c9922d-c366-4145-b879-0f0f5cbc1ee6/reluctant_fundamentalist_text.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/80b4faef-48e9-4bbf-8512-1402ab20e4b6/94748001541.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/39f0f5a6-f1d1-4b69-80f8-6576048dcbcb/52381402686.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/f34a3c59-97ca-4bf3-bfb1-d3e4f5666093/what_size_file_to_sharpen_stihl_ms271.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
- http://dejavu.sourceforge.netIn PDF document text
- http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off00012788.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12788	5416 bytes
SHA-256: `02035d4947d6fcaf7fc613d6109d3fb9c21e71953a3af4d530ca48110a3e00a0`
`font_01_sfnt_off000139dc.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x139DC	11732 bytes
SHA-256: `8c22771dbbd75c32fe117fcb69b6c6d1b5e2877baec24d2efaa9e056447b6427`
`font_02_sfnt_off0001624b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1624B	16060 bytes
SHA-256: `2d958bd008b8db5b33092f112e99c856adbcc0a100e950d14ff814b784be6357`

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