Malicious PDF — malware analysis report

Static analysis result for SHA-256 03c3914dd0272601…

MALICIOUS

PDF

104.9 KB Created: 2021-05-14 10:55:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: a86570da033422a45e0eb282c48d96ee SHA-1: ca9d7c9ea9c4c313239eaa3611070e78d9c3e3dc SHA-256: 03c3914dd027260142b448ea3538b97e39911af095af55b28845f92dfa1ebc60
186 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics as a link farm, containing a large number of external URLs pointing to potentially malicious domains. The ClamAV detection and ML classifier further support its malicious nature. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest an intent to lure users to phishing or malware-hosting sites, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://vilenefex.ru/strik?utm_term=ruger+mini+14+ammo+type PDF link annotation
    • http://fakaluwu.scienceontheweb.net/53668618724.pdfIn PDF document text
    • https://tewazaxapij.weebly.com/uploads/1/3/4/8/134873756/taxulofesunumowewag.pdfIn PDF document text
    • https://lirejodeju.weebly.com/uploads/1/3/4/6/134628820/fc6816.pdfIn PDF document text
    • http://mscgis.net/dialga_smogon_dp5ji5r.pdfIn PDF document text
    • https://xumizobizuzu.weebly.com/uploads/1/3/4/6/134688834/daniwil.pdfIn PDF document text
    • https://gapojusegora.weebly.com/uploads/1/3/1/4/131408170/8923466.pdfIn PDF document text
    • http://momarivido.mypressonline.com/allen_major_test_series_2020.pdfIn PDF document text
    • http://nemugub.mywebcommunity.org/xolivumubozedof.pdfIn PDF document text
    • https://munuradon.weebly.com/uploads/1/3/1/8/131859370/9190126.pdfIn PDF document text
    • http://verifiedbadge-lnstagram.com/basin_street_blues_sheet_music_pianoj7wdx.pdfIn PDF document text
    • http://balifruit.com/wirivavajw1eq.pdfIn PDF document text
    • http://marinarus.space/narrativa_completa_lovecraftsw5z5.pdfIn PDF document text
    • https://ziripovopibew.weebly.com/uploads/1/3/0/8/130874468/456814.pdfIn PDF document text
    • https://sidilatadafexu.weebly.com/uploads/1/3/1/1/131164021/divozez.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/7d0365c5-70a1-46e1-ab86-84d70acc432b/2003_chevy_s10_service_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5168f92-b753-47f1-a3bf-211a9bcece68/juzapekulabizibef.pdfIn PDF document text
    • https://cccd2283-d272-450a-840b-6541230ebad2.filesusr.com/ugd/5de1df_dd871d5a5a2641e8886fdcecccc642f5.pdf?index=trueIn PDF document text
    • http://bobixupeto.myartsonline.com/cazadora_de_hadas_google_drive.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54459f8b-8ff8-45b6-8cd4-c03397a43ab1/76330086234.pdfIn PDF document text
    • https://cd753cf5-d90a-4073-9c55-931a76e81761.filesusr.com/ugd/8826df_e063071eebdc425697ca5f8b2ec743c7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/40f9753b-13f0-4eae-adea-e7bb0c5b3262/refelutimiwus.pdfIn PDF document text
    • http://petojijoxura.onlinewebshop.net/data_structures_and_algorithm_analysis_in_c_3rd_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/976d341b-0d6a-4ff7-a12c-701e4697c25e/2005_nissan_pathfinder_overheating_problems.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_off00015c6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C6B 5180 bytes
SHA-256: 52e0326b8288c0e35e3af2bf04237eb89998ca4821efecfe52c6dae56790f660
font_01_sfnt_off00016e0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16E0D 12008 bytes
SHA-256: 06cd6fd8d0394d203e966106618cd856d94b4bf332680da18a6a5916b20de612