Malicious PDF — malware analysis report

Static analysis result for SHA-256 b78e53d357d6c08a…

MALICIOUS

PDF

86.6 KB Created: 2021-05-06 09:56:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: d0ffcf7af45f9c0790c41b5542809962 SHA-1: b97822950464f0dd7e4c013500084bc949565d49 SHA-256: b78e53d357d6c08ab387a55ab899b9c9e1e5eb176e47a881cd1910cab1fbc526
184 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded links that redirect to known malicious infrastructure, specifically identified as a redirector. The document body, though heavily obfuscated, suggests a lure related to leadership styles, likely to trick users into clicking the malicious links. No scripts were extracted, but the presence of malicious redirector links is a strong indicator of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/strik?utm_term=what+is+the+difference+between+a+transformational+and+transactional+leader In PDF document text
    • http://pevokepavaxe.iblogger.org/17081763508.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451212/normal_5ff2984877ca2.pdfIn PDF document text
    • http://tophomework.space/33980561553mioic.pdfIn PDF document text
    • http://gavuzusim.iblogger.org/88321136851.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414514/normal_6055cf1905e84.pdfIn PDF document text
    • https://cdn.sqhk.co/rawewosit/jiiclTm/69993955013.pdfIn PDF document text
    • https://cdn.sqhk.co/setanutoba/iVIDE18/linear_equations_and_their_graphs_worksheet_answers.pdfIn PDF document text
    • http://bidusifekinu.66ghz.com/cinderella_disney_movie_2015.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458622/normal_605ef6a42bb8a.pdfIn PDF document text
    • https://cdn.sqhk.co/dokadajij/fUTihic/total_conquest_game_download_apkpure.pdfIn PDF document text
    • http://crubr.space/43750703838ylgc0.pdfIn PDF document text
    • https://cdn.sqhk.co/kowalaxu/hhcKWhh/59940467023.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://xatudoxi.epizy.com/water_cycle_diagram_worksheet_high_school.pdfIn PDF document text
    • http://kipinoda.rf.gd/46042625905.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d36a45f7-e2a1-4efc-907a-cf571d40df51/bosesebekefakinawari.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89f5cff1-7ffc-4f3b-a3b8-fd7602589bed/14040162346.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b620f3c-50c1-41cf-807a-05474e23cc0a/american_megatrends_windows_bios_flashing_utility.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34adb2cc-2b34-4818-95c4-420b544238a7/zajivumodamunik.pdfIn PDF document text
    • http://dubawaneti.rf.gd/formal_dress_hire_gisborne_nz.pdfIn PDF document text
    • http://jovigoxuja.epizy.com/residential_certificate_template.pdfIn PDF document text
    • http://pifajipap.rf.gd/ielts_speaking_topic_vocabulary.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000105d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105D1 5292 bytes
SHA-256: 49c3d03fac4d3714263e983a43c0f46f76b2d0b3bb72476cdfc52cc59af67b14
font_01_sfnt_off000117ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117AD 11372 bytes
SHA-256: 6659d349aeb08a04edf18c95623662f5ac2fe466f2848a7338c9883115ef2b5d
font_02_sfnt_off00013e32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E32 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361