Malicious PDF — malware analysis report

Static analysis result for SHA-256 610ab39d50cfb63e…

MALICIOUS

PDF

86.7 KB Created: 2021-05-23 00:05:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: ce8871eb3a9cf8aa13a55b13f278e5a4 SHA-1: 0a1ed81e1cf2600c312af01b7aff3f7b3de09b1e SHA-256: 610ab39d50cfb63e5a851904e37b88807354e7b50828312d9f69050bb134e183
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to drive traffic to malicious sites. The primary URL, 'https://baarspo.ru/strik?utm_term=what+fruit+and+veg+are+dangerous+for+dogs', is presented as a search result, indicating a phishing or malware distribution lure. The ML classifier and ClamAV detection strongly indicate malicious intent.

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://baarspo.ru/strik?utm_term=what+fruit+and+veg+are+dangerous+for+dogs PDF link annotation
    • https://jovoxuton.weebly.com/uploads/1/3/4/5/134513342/safopiz-rasutadadedasuj-nasuxawef.pdfIn PDF document text
    • https://rasiporimi.weebly.com/uploads/1/3/4/6/134614798/be6ba0b64.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384045/normal_6050612d7075c.pdfIn PDF document text
    • https://ruxabetuju.weebly.com/uploads/1/3/2/7/132740595/pepirisamakonopowinu.pdfIn PDF document text
    • https://robedovetukurur.weebly.com/uploads/1/3/4/7/134754045/reradosiwenimum-wobogetagelet-leniduzokawuv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457843/normal_5ff4fa70ae4cd.pdfIn PDF document text
    • https://zofazozudu.weebly.com/uploads/1/3/0/7/130739697/5c530490.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457620/normal_6014a11dd0eff.pdfIn PDF document text
    • https://lokulubebu.weebly.com/uploads/1/3/1/8/131856352/lolanafituwebega.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In 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/cea3c0c0-0255-49b6-a766-93af3aa1a28b/what_is_white_sauce_on_mod_pizza.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ffe90343-48f1-4a2e-b193-468bbee7dc73/luralibukanorowovanor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1374bab9-9be4-4b0e-ad27-b3a912b30e0a/11887020466.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a57f01a5-de78-49d1-be7f-cdbe19382965/13582303451.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68fe24b0-1942-4ae5-8028-7a2ffe475caf/37599725740.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a29f68ae-8eb8-4344-844b-397d839b2678/13675229985.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/96870db8-87f5-4ab0-b371-864916d26666/54535125473.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0775797c-1c98-40c0-bb8a-5a5b82b563f7/computer_hardware_and_networking_books_free_download_in_gujarati.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/47183cbe-ba37-4923-afc3-c9c1fb38a7d7/42582144350.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2881659c-3b04-4645-b1a2-40b22e9609a9/wopipuwufujolipejukigem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/08eb658b-ed4d-4c6d-9ece-d736fcea3c0b/is_there_a_remake_of_the_exorcist.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21991b15-e240-4bc2-97f2-b8c4e6bdfd05/is_electricity_cheaper_at_night_pseg_nj.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_off00010766.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10766 1852 bytes
SHA-256: b8a51c02b0fbc13296d47ee2368f17838986a659d8ac410cbddc48a2a1a5ec0a
font_01_sfnt_off0001103d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1103D 5212 bytes
SHA-256: ee1f54cece5d01f0a6271639ed629382a595c345d850d89e1aadd5452d9b4c7b
font_02_sfnt_off0001220a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1220A 12740 bytes
SHA-256: 11cb604a515ace658fb1675399c13a9800ddc75d66cc9503a0121dbcd10dbcf9

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