Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d7331bbf79e127a…

MALICIOUS

PDF

88.4 KB Created: 2021-04-17 07:24:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 8a8d3ef2221c0369d5de1f2318342b5c SHA-1: 76cda0c7b31a87536a2e1a702dde56b0f6758668 SHA-256: 8d7331bbf79e127aa8338eb000132a97aa162657571ce918ce2906326f9d9451
126 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The document body, though heavily obfuscated, contains references to 'Ipad mini 4 screen replacement', suggesting a lure for users. The presence of numerous external URIs, many pointing to disposable hosting and employing UTM parameters, indicates a phishing or scam campaign designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://midufefew.ru/strik?utm_term=ipad+mini+4+screen+replacement+with+home+button PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4446651/normal_60145ff7180c2.pdfIn PDF document text
    • http://serarudipiwuvon.mypressonline.com/axar_publication_english_grammar.pdfIn PDF document text
    • http://vorusobowa.66ghz.com/tiwujemaludakedog.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391305/normal_5ff7d65d314bf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414691/normal_600888d7285b5.pdfIn PDF document text
    • http://gunenekaroz.mypressonline.com/44882105992.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391305/normal_601da07d13043.pdfIn PDF document text
    • http://seluluxafej.22web.org/software_effort_estimation_template.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fowakoleviwamop.onlinewebshop.net/mathematics_dictionary_english_arabic.pdfIn PDF document text
    • http://najovuwovi.rf.gd/dojamujabatojasuvoxu.pdfIn PDF document text
    • http://kolixuvurivol.epizy.com/children_s_apperception_test_cards.pdfIn PDF document text
    • http://nufiwimuzobo.onlinewebshop.net/46730858216.pdfIn PDF document text
    • http://wororezijetixa.atwebpages.com/i_o_buffering_in_operating_system.pdfIn PDF document text
    • http://lojosikol.epizy.com/21279029401.pdfIn PDF document text
    • http://wuwedilejom.myartsonline.com/mumazowekulox.pdfIn PDF document text
    • https://de99934f-f465-4d69-af5e-14f317c0a7c6.filesusr.com/ugd/4fea5c_ff983abf8cd2428b97e33ac7e87a5b75.pdf?index=trueIn PDF document text
    • https://f2f8a3c9-3ea7-4a25-b7e2-3e2749f32899.filesusr.com/ugd/f0e51d_ece6f98d5a044737ba415b3170b52f4e.pdf?index=trueIn PDF document text
    • http://jaminuzifibe.onlinewebshop.net/accordare_batteria.pdfIn PDF document text
    • http://javajese.epizy.com/wosalapiripaliv.pdfIn PDF document text
    • http://gijomifede.rf.gd/machine_learning_bayesian_and_optimization_perspective.pdfIn PDF document text
    • http://sikozodiz.rf.gd/hunger_games_mockingjay_part_2_ending_scene.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_off000119c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119C0 5572 bytes
SHA-256: 329daf95c6cc79ea3d707d84bc09dad56bfb7a28dd90385496c9f77cf2e3c068
font_01_sfnt_off00012c92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C92 10956 bytes
SHA-256: 13ff16b700b6bdcbadd7df99fffbe2ef9be238f1280b94973ffc9cc0fa5a8403

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