Malicious PDF — malware analysis report

Static analysis result for SHA-256 9129cfd963f2fd4a…

MALICIOUS

PDF

82.6 KB Created: 2021-03-28 18:19:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 22b29785b783cd707e4e39a77dec9d9c SHA-1: 7cb9b07f693dd1ac458756712c7d3c2e0f27d641 SHA-256: 9129cfd963f2fd4a75b04202afe32ff516a9abb93d7d526a6a4607c3e41e0101
184 Risk Score

Malware Insights

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

The PDF contains embedded URLs that redirect to malicious infrastructure, as indicated by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though heavily obfuscated, appears to be a lure related to financial compensation, likely intended to trick users into clicking the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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
  • 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://dafemum.ru/aws?utm_term=how+much+does+foster+parents+get+paid+in+nc In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366000/normal_603c061ba3e18.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375896/normal_5fda84022f310.pdfIn PDF document text
    • http://study-english-05.site/516411124813h46l.pdfIn PDF document text
    • http://weraka.online/30306686156uuf2j.pdfIn PDF document text
    • https://cdn.sqhk.co/sezivalaw/bNlQgjQ/pupeniper.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389106/normal_60377f2838855.pdfIn PDF document text
    • http://usblighter24.site/pizubigezilirakovepaxyz30.pdfIn PDF document text
    • https://cdn.sqhk.co/gimovitax/JhbtSsS/rajunajunuba.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470402/normal_5ff5261c10b2a.pdfIn PDF document text
    • https://kutumamam.weebly.com/uploads/1/3/4/8/134893394/6662776.pdfIn PDF document text
    • https://sibuvavaxo.weebly.com/uploads/1/3/2/6/132681946/5dc3f7a8.pdfIn PDF document text
    • http://ch-redirect.icu/power_book_2_ghost_new_episodesdffjp.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408983/normal_60002e9b35091.pdfIn PDF document text
    • https://kubikogemovi.weebly.com/uploads/1/3/4/0/134095998/4119348.pdfIn PDF document text
    • https://pigokujedaxe.weebly.com/uploads/1/3/0/7/130740563/8413255.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/0eb9970d-34e7-4c4d-a806-770129dd9796/52198914723.pdfIn PDF document text
    • https://s3.amazonaws.com/vuxirefare/50870097151.pdfIn PDF document text
    • https://s3.amazonaws.com/wekibik/donacloney_primary_school_inspection_report.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb781a3a-78c4-4dfd-84dd-b59c7331a510/mozilibojavevuw.pdfIn PDF document text
    • https://s3.amazonaws.com/negonanopix/lanenutijug.pdfIn PDF document text
    • https://s3.amazonaws.com/dukavunivifa/vifudidaxalevosafo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c37c495d-1879-49eb-9648-a0d57e7fecc9/30594838418.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/27338731-bb12-4cd1-80c3-8f70d576237d/24022806784.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8bb7fc3c-45ff-4fbb-88b2-4424077d1516/94502790576.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_off00010413.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10413 5588 bytes
SHA-256: 3bac8577fd5c41d09aff4bc949730d136da81a9d94d2c07c12d00e4875ca2756
font_01_sfnt_off00011700.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11700 11124 bytes
SHA-256: 6cb18bea552ab2c788d80fe49357960effc0569a9da2a6f8b05b748844f08318