Malicious PDF — malware analysis report

Static analysis result for SHA-256 a76de393be12b036…

MALICIOUS

PDF

81.3 KB Created: 2021-03-11 17:22:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: e3e9df36d4c49a2ca1dd1274f50522e7 SHA-1: 839fbef152bc2f89cbdee04856e01a7e11088646 SHA-256: a76de393be12b036308cecf4f43e376f776fbdaff9b9d316710086739f2a95ee
186 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. Heuristics indicate it contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users. The document body, though heavily obfuscated, contains keywords related to visa applications, reinforcing the phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://xajibur.ru/award?keyword=albania+visa+application+form+pdf PDF link annotation
    • http://rp-youtube.fun/473433012750mt60.pdfIn PDF document text
    • http://pagebake.com/21954602694rkqiw.pdfIn PDF document text
    • https://cdn.sqhk.co/lajefage/JkAuii5/snowboard_craft_freeski_sled_simulator_games_3d.pdfIn PDF document text
    • http://zapapoberok.iblogger.org/nice_guidelines_seizure_pregnancy.pdfIn PDF document text
    • http://matrixbicycles.com/zejedimaresosolomelopasev4cj.pdfIn PDF document text
    • http://rulazix.iblogger.org/zijumafukote.pdfIn PDF document text
    • https://cdn.sqhk.co/gonolesuzam/iiihbhi/cheats_for_minecraft_xbox_360.pdfIn PDF document text
    • http://rimugojitiwimun.iblogger.org/surewirigivena.pdfIn PDF document text
    • http://effektzhizni.ru/how_to_start_a_synthesis_essay_exampletjidt.pdfIn PDF document text
    • https://cdn.sqhk.co/sewadokoka/ggDM4ia/star_wars_timeline_2019_mandalorian.pdfIn PDF document text
    • https://cdn.sqhk.co/fenazijeguk/i5jdwii/gatapuwatuwagaxofavuzijik.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://finuximiwogum.rf.gd/60923059192.pdfIn PDF document text
    • https://d5fd0048-bb8d-45a1-ba21-28d1cb0b7162.filesusr.com/ugd/5e8de6_50a38d629b8d41d6986ab98bd3a3ca60.pdf?index=trueIn PDF document text
    • https://46c0acaa-de7d-4f46-84f0-c2cf1d8ff7d9.filesusr.com/ugd/ac1638_dc15344745be455ea1a0b5336fe1d15c.pdf?index=trueIn PDF document text
    • https://ff743420-c5e2-4527-a456-70ddb2a1abd8.filesusr.com/ugd/5178f2_1754f775416b4e08bf691fcf9faf67d7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d70038f4-2e78-4373-a804-e16fc020dbb9/4506957275.pdfIn PDF document text
    • https://84bd2c60-91d0-47b6-9565-6ae8a6593e58.filesusr.com/ugd/963627_39008b85fece47fab8ed1d82d55d01a3.pdf?index=trueIn PDF document text
    • https://da550aaf-34ae-4f9b-ad82-7836b82beebe.filesusr.com/ugd/a203e6_fe8b438091544bbba9a11065d9673bff.pdf?index=trueIn PDF document text
    • https://31c8a3d4-0132-49f1-a04f-09c79d03e01f.filesusr.com/ugd/a4da84_e4ef4b51c77f401290747b850f4a21c1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/064a9ed9-d884-438e-943b-3f314d3e9acf/zijepoz.pdfIn PDF document text
    • https://05b56818-8b0b-4484-a411-4f1234233f1c.filesusr.com/ugd/e49726_781fc0c98eca4579805d4993ce68c6b5.pdf?index=trueIn PDF document text
    • https://790985df-dfec-4a08-b509-00f37668cf87.filesusr.com/ugd/a421e3_7b975f689fa743cfbc8329596885b3b9.pdf?index=trueIn PDF document text
    • http://zodumuf.rf.gd/school_subjects_vocabulary_matching_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f1fa4aa-0779-4412-bff6-16b68f7a4d34/xisutex.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_off00010126.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10126 5488 bytes
SHA-256: 8ee3ab457838e9403377d7379539bd634fecc7954b336e84cec48f39f463ade7
font_01_sfnt_off000113bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113BC 10428 bytes
SHA-256: 311b6f24417ef758b74c3de76a25109d606eec1f8fa147e8e0e11bade48f6614