Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d366b58e76a069d…

MALICIOUS

PDF

81.8 KB Created: 2021-05-27 22:52:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 9f4dede7b48651ab5922c94e3acb7493 SHA-1: 20f93350ee528f96f203dc3d59dd95b52b003bd1 SHA-256: 6d366b58e76a069d9a0321fcd9103207084eeaa5c65d63148462563b5d03332c
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate maliciousness. While no scripts were explicitly extracted, the PDF structure itself facilitates the redirection to malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://resalured.ru/123?utm_term=emulator+ps1+untuk+android+tanpa+root PDF link annotation
    • https://miwimuwal.weebly.com/uploads/1/3/0/7/130775744/xemanuga.pdfIn PDF document text
    • https://kubuwexujilo.weebly.com/uploads/1/3/4/4/134473085/koxopozu.pdfIn PDF document text
    • https://tavumake.weebly.com/uploads/1/3/2/7/132740551/puxepepisofo.pdfIn PDF document text
    • https://momiretet.weebly.com/uploads/1/3/5/3/135345559/9890357.pdfIn PDF document text
    • https://jibabarudemafe.weebly.com/uploads/1/3/4/7/134748102/0e16183a.pdfIn PDF document text
    • https://kimewazokedusa.weebly.com/uploads/1/3/1/4/131454536/lejoxemisuba.pdfIn PDF document text
    • https://bejazono.weebly.com/uploads/1/3/5/3/135315558/d386aa25.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446017/normal_60647b9152235.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407062/normal_6006514c20c69.pdfIn PDF document text
    • https://pujibotawajifuw.weebly.com/uploads/1/3/1/3/131379639/1f762e3aefc4.pdfIn PDF document text
    • https://revowerixes.weebly.com/uploads/1/3/1/6/131607662/4031400.pdfIn PDF document text
    • https://samarobiratepiw.weebly.com/uploads/1/3/5/3/135327643/1941569.pdfIn PDF document text
    • https://kimewazokedusa.weebly.com/uploads/1/3/1/4/131454536/dedokelowak-jujikazepafaza-tefemuzukir-suzuf.pdfIn PDF document text
    • https://duxegolukazokun.weebly.com/uploads/1/3/1/3/131398215/letinapirawuzup.pdfIn PDF document text
    • https://fuvodaxe.weebly.com/uploads/1/3/1/3/131379021/6479605.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/82d92d88-2bc3-4a10-86f6-dd74486d9d97/xokenekasevepomu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d818d98-78fd-457c-aef9-d331d18d7f61/is_graco_better_than_safety_1st.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ae43966-a944-47e1-a5d4-a37748b31d58/how_to_adjust_flame_on_heat__glo_fireplace.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/76e893c9-31b5-42d2-99f0-9f05c5a85c67/32600743046.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED92 5176 bytes
SHA-256: fe1b359c9ba4631778f6a4841b87055d183684e7073f7364eaa161c52f7c57c0
font_01_sfnt_off0000ff14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF14 10672 bytes
SHA-256: b8aaf36a6d86d53521d221106225741b5614ceedfe54580a11b5677862c22f01
font_02_sfnt_off000123f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123F2 16376 bytes
SHA-256: f267a97a42ed964490c0c36cf8d24d30f5cfc386ee24850e75bb3a4991f11828