Malicious PDF — malware analysis report

Static analysis result for SHA-256 63d598446bb38764…

MALICIOUS

PDF

74.8 KB Created: 2021-03-18 02:58:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 11fbfb0d2166e6f407d02a7459a82e19 SHA-1: e479d7b09be695350c92c0bf3739f0d649d5347d SHA-256: 63d598446bb387644156cd148aaec7504f2e48c4a0424d57568f460668bab8ee
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to a suspicious domain, 'resalured.ru', which is likely used to host a malicious payload or redirect to a phishing site. The document body, though heavily obfuscated, suggests a lure related to 'lyrics pdf'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://resalured.ru/123?utm_term=ancient+words+lyrics+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4484363/normal_60515c14181de.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366398/normal_602f2e557b5f9.pdfIn PDF document text
    • http://itwow.info/3508585808520893.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475564/normal_5ffe84c11c8d1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416796/normal_601f2f5e13053.pdfIn PDF document text
    • http://qunit.space/larufawigodenixudigefie0nvh.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460447/normal_603fdc56def12.pdfIn PDF document text
    • http://ejinaya.com/maus_2_spiegelmang1hw3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417998/normal_604a5d027e3da.pdfIn PDF document text
    • http://latencfsrt.space/which_smart_thermostat_does_not_need_a_c_wirec3as0.pdfIn PDF document text
    • http://fly-drive.online/best_free_antivirus_for_android_phonescl5hi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449411/normal_5ff11599dba32.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458417/normal_604ce282f15d5.pdfIn PDF document text
    • http://wgathering.org/xagajodufejilw4lr.pdfIn PDF document text
    • http://womebaziwime.iblogger.org/34906531761.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/c30985f9-51a7-489f-bc6c-871888b13c00/krk_rokit_5_studio_monitors_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ac4fbbc-0180-4f5e-a747-8ba13d99d1bf/what_martial_art_does_special_forces_use.pdfIn PDF document text
    • http://tedusola.epizy.com/xewuw.pdfIn PDF document text
    • http://lofuwokapowudug.rf.gd/flipping_death_platinum_guide.pdfIn PDF document text
    • http://jaremov.rf.gd/bivozowasufotoxi.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e76b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE76B 5120 bytes
SHA-256: 61ee9029a0107989176be80de4df9746f8509130710d1f66f441f020076a0095
font_01_sfnt_off0000f904.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF904 10820 bytes
SHA-256: f0447d496dc05449e8af0d52b562bebfd96b45080c83c25b03307b5afb36f3e3

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