PDF malware analysis — malicious · aa83c00dabf975f0

MALICIOUS

PDF

95.8 KB Created: 2021-07-16 11:44:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)

MD5: 10a24a03a2e41ee29b226263edb7c17b SHA-1: 56ab7b10ddfe29b0a0fd9e93a0c1ba2461a40fc3 SHA-256: aa83c00dabf975f0e9a04d10a2b05687254f1bc6d0980a8b605c5a85290e8cc3

96 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains an external URI pointing to a suspicious domain, krisoc.ru, which is likely used to host a malicious payload or phishing content. No scripts were extracted, but the PDF structure and external URI suggest it's part of a phishing or malware delivery campaign.

Machine Learning

Nyx PDF Classifier malicious score 0.9918

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://krisoc.ru/square?utm_term=x+axis+is+the+intersection+of+two+planes
- https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ed39cdf84adf285bf06d5b/1626159565268/42588612262.pdf
- https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60f0adce98358e582fa392af/1626385870772/high_router_latency.pdf
- https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60e8bb9fc5d97713370812c2/1625865119915/3_pm_edt_to_ist.pdf
- https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60f1217944f13e0787b273be/1626415481817/xemifoduvotusukevi.pdf
- https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60f0c657f32be22f007140e5/1626392151401/the_relative_permeability_of_a_ferromagnetic_material_is.pdf
- https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60f11e5ff32be22f00767fd5/1626414687352/99094333576.pdf
- https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60f076f891b8e868d2892062/1626371832399/bill_of_lading_and_airway_bill.pdf
- https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60efccc6e4fb0f110d796fb6/1626328263162/58740639015.pdf
- https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ee4a990b33b63bb8c6ea5a/1626229401971/52659111110.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://dejavu.sourceforge.net
- http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off00011158.bin` `7ef4a7594c4115fcd85f6da9c3d287649b92ac4fc18137871187c488458a9f31`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11158	17888 bytes
`font_01_sfnt_off00014062.bin` `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x14062	16792 bytes
`font_02_sfnt_off00015879.bin` `b2833eccc7529a64ddd77fa53e80753896cd14392a55ffe9e826c40a2bdc793b`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x15879	10772 bytes

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