Malicious PDF — malware analysis report

Static analysis result for SHA-256 24e77c2658b591e5…

MALICIOUS

PDF

84.0 KB Created: 2021-04-07 20:58:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4b09018a6534e9c6fe5f468279cbfb94 SHA-1: 71f3459e20505f3d8de4a15752a988f8dfd97ffd SHA-256: 24e77c2658b591e5b3a51722f651615e3ee1430c31950687b4df0209f6309a9b
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains an embedded URL pointing to 'pelibifir.ru', which is highly suspicious. Although no scripts were explicitly extracted, the PDF structure and the presence of an external URI suggest an attempt to redirect the user to a malicious site, likely for phishing or to download a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://pelibifir.ru/strik?utm_term=tower+of+the+mad+mage+walkthrough
    • https://cdn.sqhk.co/lixozimiz/T3nsYTv/dune_tv_series_where_to_watch.pdf
    • https://cdn.sqhk.co/bijininabex/hbxMm3u/virtua_tennis_challenge_pc.pdf
    • http://tigazefu.iblogger.org/fesixilavudunu.pdf
    • https://cdn.sqhk.co/xelajuwodaf/hgfgcgd/zanejanumemarij.pdf
    • http://xovasaf.iblogger.org/luxury_travel_guide_awards_reviews.pdf
    • https://cdn.sqhk.co/zexukobesu/RSD4qlS/89217208723.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://ravexigulot.rf.gd/online_to_word_document_converter_software.pdf
    • https://s3.amazonaws.com/zabevog/blackberry_classic_touch_screen_sensitivity.pdf
    • https://7893bdd6-41e4-48f6-9953-3a636dfb5d61.filesusr.com/ugd/c5c63b_ce3d4198cabb48fc80f164e367b5d2e4.pdf?index=true
    • https://be56f97b-0727-4a8e-a141-4155b83e75ac.filesusr.com/ugd/5034d0_b9f9fe0b9bec4fde8527939d3f0beb51.pdf?index=true
    • http://nanesipub.rf.gd/vopesuzakipivi.pdf
    • http://deburukibovip.rf.gd/23279258058.pdf
    • http://narajogevimoxe.epizy.com/ligedarubuvezejirokuz.pdf
    • https://6196a4e6-b3b5-4a85-a139-4ec84e0a53d9.filesusr.com/ugd/d01287_5641eb5d68f947a2afbbfb434e7ab98e.pdf?index=true
    • https://s3.amazonaws.com/vipuxafol/44732940100.pdf
    • https://s3.amazonaws.com/divelatoxa/what_is_educational_psychology_definition.pdf
    • https://69b3109a-7cce-4514-9193-d2106d9976ab.filesusr.com/ugd/3c2969_1050aef97ef944d1b69e256c2dba1713.pdf?index=true
    • http://mewivoxirogowe.rf.gd/basic_bodice_block_pattern_drafting.pdf
    • https://s3.amazonaws.com/bulolimepol/10436681598.pdf
    • https://9c43cb74-45e3-47de-9527-fda2e8336169.filesusr.com/ugd/af0aa9_2cc90039c7064643a72be10020b8e083.pdf?index=true
    • https://s3.amazonaws.com/tamobalasu/34326029455.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fdd1.bin
85844534ea7cea51dfe60fdf25f4d775ca69a2d528ef778859ef8bcb3a950209		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFDD1 4976 bytes
font_01_sfnt_off00010ed4.bin
45c524aabb595ce398ffe526ff84d545193dc2e2058b2ee907b456591c6021d3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10ED4 11168 bytes
font_02_sfnt_off000134b8.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x134B8 4324 bytes

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