Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0db1eafa53483d3…

MALICIOUS

PDF

82.3 KB Created: 2021-04-27 16:53:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eb4b08cd0aef3454270d6512e0b459a1 SHA-1: 7810f4c236889806b66aa3cf3b0fe93581785807 SHA-256: d0db1eafa53483d31d76bee324e5149cf045220b3aa2e5c2619934c789b3b213
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs, including one that appears to be a lure for technical support, and another pointing to a suspicious domain that likely hosts a secondary payload. The document body, though heavily obfuscated, suggests a theme related to troubleshooting a JBL soundbar, a common tactic for phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://vilenefex.ru/strik?utm_term=why+is+my+jbl+soundbar+not+connecting
    • http://euroshopmn.space/bitcoin_miner_android_v1._02zdfy.pdf
    • https://cdn.sqhk.co/xaxamipuxum/ic0jhjd/ribatumobiba.pdf
    • https://cdn.sqhk.co/fezivabuja/ijVgf3Y/88943371545.pdf
    • http://reflectionss.space/4310591453m5g1.pdf
    • http://muzhskoizhurnal.ru/gasimwu6t4.pdf
    • http://alisabor.design/suburomilesotedu3qrtm.pdf
    • http://form-lnstagramverifiedbadges.com/android_accessibility_suite_meaning_in_tamil057nt.pdf
    • http://krepezh.guru/383022537694ivml.pdf
    • http://circulyarkadigital.xyz/59064308660rucll.pdf
    • http://goldstein.capital/lagewovocqcl0.pdf
    • http://lakcherie.ru/how_to_fight_with_a_pocket_knifevd15n.pdf
    • http://auto-agents.space/stilbene_melting_point0x6s3.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/8ca3bb24-69d7-4cc1-83f5-f3f682cd0382/goropabu.pdf
    • https://s3.amazonaws.com/navoburarovada/how_to_read_the_bible_and_understand.pdf
    • https://uploads.strikinglycdn.com/files/6b6f6eb0-a960-409c-a261-f310a1943f81/jisolo.pdf
    • https://s3.amazonaws.com/xefezesebusu/24025495282.pdf
    • https://uploads.strikinglycdn.com/files/63bd4e1e-2157-4053-9636-7ba62f1b4064/gejidererewoged.pdf
    • https://s3.amazonaws.com/jusagi/30497618216.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.

FilenameKindSourceSize
font_00_sfnt_off000101cc.bin
dd0e38085c9819d675fe23a0b8f61889c68e37547d09415deeaad27a7159132c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x101CC 5684 bytes
font_01_sfnt_off00011505.bin
8cbb7dd70de547e5b56fabf0aaeab58b5865838358002fcbfe7621a6796d9cc8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11505 11476 bytes

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