Malicious PDF — malware analysis report

Static analysis result for SHA-256 94729d756db713d6…

MALICIOUS

PDF

79.2 KB Created: 2021-03-08 12:08:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 02a0eb9a228a99315ac76d3cabd7a1df SHA-1: ee69ca62d5e0627a8cb61963f55232d03cfc8822 SHA-256: 94729d756db713d65105d1f19ffa2a5ea8771b0826262ad06e9e2b59e2e861b2
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier. It contains a large number of embedded links, many of which point to disposable hosting or known redirectors, indicating a link farm designed to direct users to potentially harmful content. The primary malicious URL identified is https://crophysi.ru/strik.

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
  • 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 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.
  • 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=does+chick+fil+a+have+a+20+piece+nugget In PDF document text
    • https://wobereresexo.weebly.com/uploads/1/3/1/6/131606335/87d3a.pdfIn PDF document text
    • https://tefojemitadu.weebly.com/uploads/1/3/1/6/131606809/pamatugolewo.pdfIn PDF document text
    • https://kufepodesaf.weebly.com/uploads/1/3/4/3/134336702/xolevupazo-mujes-niluxu-wunisidova.pdfIn PDF document text
    • https://nugilura.weebly.com/uploads/1/3/5/3/135317706/xozuleresir.pdfIn PDF document text
    • https://tobivuzulukimu.weebly.com/uploads/1/3/1/3/131384599/dejetoteravujan.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://c6f55193-7475-4343-97dd-33cb3b141b6a.filesusr.com/ugd/808d8c_0a4cd52850de4e21ad4d7671deae1681.pdf?index=trueIn PDF document text
    • https://e82ff0bd-cb1a-4782-8b92-0a0fb7657660.filesusr.com/ugd/d17951_13547200fa1048ab8ca67403f43f05ba.pdf?index=trueIn PDF document text
    • https://46b09160-81f9-4cb3-9cca-f7b5b0c0229e.filesusr.com/ugd/179cc6_8f131210db614eaba615d673de017245.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/fef42fb5-8b8d-4109-b7e8-caf9c45de9d2/how_to_remove_ge_profile_microwave.pdfIn PDF document text
    • http://mutaluwuvekigo.rf.gd/tekiponabipe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2cb96c42-5e04-4c74-a2e8-745a35b56156/93412914756.pdfIn PDF document text
    • https://6eed613e-cbae-405e-b458-9655ef9033f8.filesusr.com/ugd/e4f6f0_24257dd667d546e4bda473d31b4f5ca0.pdf?index=trueIn PDF document text
    • https://e8f98835-b194-42a5-b43f-fe2f29920dd6.filesusr.com/ugd/bf650e_e96375bd3e9346a2976ae614c742798a.pdf?index=trueIn PDF document text
    • http://kobukapun.epizy.com/sunitutajomafuw.pdfIn PDF document text
    • http://noworevapetero.epizy.com/fusujodise.pdfIn PDF document text
    • http://bumilofu.rf.gd/pusejabegegajuwukat.pdfIn PDF document text
    • http://vinodek.epizy.com/39195241864.pdfIn PDF document text
    • https://9afb1793-bc57-4514-bb46-74e980466609.filesusr.com/ugd/11f207_090ba0b1d45f412cb321807009e95496.pdf?index=trueIn 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_off0000eb10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB10 5460 bytes
SHA-256: 95f004763f35ee6f82eb8889c70c1413816ebc4383961d3bddba550ca5416574
font_01_sfnt_off0000fda7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDA7 10588 bytes
SHA-256: 427e8c18c08b3007d262e81ed0deecee8cc47029988c5c76693a0d4a0cb71c9c
font_02_sfnt_off000121a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121A8 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c