Malicious PDF — malware analysis report

Static analysis result for SHA-256 c11a82b899043ff2…

MALICIOUS

PDF

79.5 KB Created: 2021-04-16 09:51:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 6d296774cc3e8af398187f72559dc940 SHA-1: 56c90cd4686e3b873b9b43bc4382c4e6057d3954 SHA-256: c11a82b899043ff25187edd2c425a1bc068bdf6a4eda49d7fe9ebfde2f7ba403
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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/strik?utm_term=where+to+donate+used+clothing+near+me PDF link annotation
    • https://nemabofafuz.weebly.com/uploads/1/3/5/3/135389169/zolomenu-dejopukewiper-tagijago.pdfIn PDF document text
    • https://leludexubivavij.weebly.com/uploads/1/3/1/8/131860378/48f89b4b38.pdfIn PDF document text
    • https://vomedizi.weebly.com/uploads/1/3/5/3/135312409/wupitedibisu.pdfIn PDF document text
    • https://malosana.weebly.com/uploads/1/3/5/3/135323031/3a8bc.pdfIn PDF document text
    • https://zokexeti.weebly.com/uploads/1/3/5/9/135966989/1687664.pdfIn PDF document text
    • https://lulegosepo.weebly.com/uploads/1/3/0/9/130969478/koxuvode-vaforozum-logazofowag.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
    • https://s3.amazonaws.com/vokeri/proform_235_csx_recumbent_exercise_bike_reviews.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/229230ad-72ce-42d3-995e-42a2e638d373/45777308112.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff51e043-a83b-424a-87c2-8c2a5b36b469/what_is_the_cost_of_a_postage_stamp_in_canada.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dbeb49f1-faf6-4ec1-8343-bae2ae73013f/how_do_you_scan_multiple_pages_into_one_document_on_a_canon.pdfIn PDF document text
    • https://s3.amazonaws.com/fofeguj/coordinate_plane_pictures_halloween.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf735d7f-463d-402e-9647-e6ea2a29e495/xukamivevazixemuxamo.pdfIn PDF document text
    • http://golukotekitu.epizy.com/salary_of_senior_software_engineer_in_malaysia.pdfIn PDF document text
    • http://zalezir.epizy.com/76510701719.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c8dbb87-55d2-46f6-94cb-45053b3132ef/monster_unlock_the_vault_2021.pdfIn PDF document text
    • https://s3.amazonaws.com/vavebufevodutob/miperurusikojikewix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1472c69c-a8c8-48f7-aaa9-a37ebf7c1506/12723482833.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bfb7601c-181c-4456-aaa8-1636cc569396/xefewovakad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed1b2d9d-7df3-450a-b949-2310c8201e7a/ziguxibetiralupemipafare.pdfIn PDF document text
    • http://kuxoxulid.epizy.com/tekarixepa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a132b2cc-db93-4cf0-8e63-c0d4ce2dbc31/zalerurizetuxe.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_off0000e993.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE993 5248 bytes
SHA-256: 8733168d5656666a0d1ab96269f253b67a9ba58e4be5d6472c83fe6ea7c114e5
font_01_sfnt_off0000fb46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB46 11368 bytes
SHA-256: a4979e21890bd64c84beb4a74979dd822a1781624144c1de7d6000c224a58bfd
font_02_sfnt_off00012200.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12200 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176