Malicious PDF — malware analysis report

Static analysis result for SHA-256 9421743454976985…

MALICIOUS

PDF

75.2 KB Created: 2021-04-13 19:01:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4944d1278172bccbfb9d687f3a4512b6 SHA-1: b07addf7b4231a11ade79b4fd43e3a8fa43948e2 SHA-256: 9421743454976985812ec8848b3d614d3fa8edebddb18cf7974df3fa129586ed
156 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a link farm and an embedded URL pointing to a site related to Apple ID password recovery. ClamAV also detected this as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and embedded links suggest a phishing attempt to harvest credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://vilenefex.ru/strik?utm_term=how+to+login+to+apple+id+forgot+password
    • https://binezorimitujux.weebly.com/uploads/1/3/4/3/134337637/wafatujupudaru.pdf
    • http://vonowaz.iblogger.org/tuxajat.pdf
    • https://gozetosudoz.weebly.com/uploads/1/3/4/6/134601595/sudixurabe.pdf
    • https://wipamixupes.weebly.com/uploads/1/3/4/4/134460990/45c633ee.pdf
    • http://jepatugikanoxuv.iblogger.org/toluletorozazuga.pdf
    • http://kipuleli.iblogger.org/programa_de_honores_a_la_bandera_secundaria_tecnica.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/2ca6c9fe-efd9-4f9d-8fe5-1e03f18ed644/big_fish_audio_and_vip_loops_-_swagg.pdf
    • http://likewiwojuxus.atwebpages.com/zoboboxa.pdf
    • http://natizuf.onlinewebshop.net/wesitufilibuwamodogeb.pdf
    • https://uploads.strikinglycdn.com/files/eab1ad99-71b4-42f4-b075-531fcd576b40/cuisinart_dlc-8sy_pro_custom_11-cup_food_processor_parts.pdf
    • https://uploads.strikinglycdn.com/files/a6bc50dd-833d-4aa1-b069-c0962954d2a3/whats_the_difference_between_spd_and_spd-sl.pdf
    • http://vutagoviwimet.rf.gd/treatment_of_hepatitis_c_virus.pdf
    • http://jujabezemaluwe.rf.gd/1525358141.pdf
    • http://sasoregasot.epizy.com/rest_api_performance_testing_jmeter.pdf
    • http://livewimujekofo.rf.gd/what_does_it_mean_when_my_juul_is_flashing_green.pdf
    • https://uploads.strikinglycdn.com/files/20643f86-0f9a-4486-a5ae-5133b539a1bf/my_maps_tutorial_2020.pdf
    • https://uploads.strikinglycdn.com/files/266a8f10-c4d6-4af0-9a0b-fd517b41b58f/wagner_paint_gun_lowes.pdf
    • https://uploads.strikinglycdn.com/files/daa82e8b-6a1e-4a07-a79a-9eb2931af7fa/muvuweze.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_off0000e6bf.bin
1918ed08a221633514229f9528cf4352946bcbe39368576ba4c988fd566c4e1d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE6BF 5260 bytes
font_01_sfnt_off0000f8cb.bin
7ff3ffe2960070fd6be83d7289666012130518cae768797b348f10e66aeab158		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8CB 10984 bytes

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