Malicious PDF — malware analysis report

Static analysis result for SHA-256 6022f48801578f34…

MALICIOUS

PDF

71.9 KB Created: 2021-04-03 10:27:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 458f44d37de7b171bd366664402c42dd SHA-1: 9059a5dd5cdb382a7a5155b03f744120cb2524b8 SHA-256: 6022f48801578f3472b51712e544836a4fe0d4b6302e04c00631b8301b5796ce
186 Risk Score

Malware Insights

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

The PDF document contains numerous external links, identified as a link farm, with the primary URL being a lure for "finalization of accounts". The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or SEO spam purposes. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://leonvi.ru/award?keyword=finalization+of+accounts+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4413838/normal_602ed9c8b1aba.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4505326/normal_5ff10602d01e8.pdfIn PDF document text
    • http://boxupoxegetoji.22web.org/management_cases_peter_drucker.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382412/normal_5fda19e54e9a5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386354/normal_5fd84cf181330.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476010/normal_5fed14c5b5bed.pdfIn PDF document text
    • https://cdn.sqhk.co/jedugifaxido/eheBzje/download_wrc_the_official_game_android.pdfIn PDF document text
    • https://cdn.sqhk.co/xuxofidipo/ggiL1ii/69780397597.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484812/normal_60652919ac676.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484997/normal_5fc9e8aa7702d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370767/normal_604167c8e619b.pdfIn PDF document text
    • http://kitusozuza.22web.org/9834257492.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469359/normal_60594e3e6c449.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421776/normal_60405ba764041.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://malanawojuko.epizy.com/simudotupadis.pdfIn PDF document text
    • https://abaaaae4-9231-44fc-b12c-ad55ebcc68e7.filesusr.com/ugd/2ca09c_f8ee5722b3244c30bf3e4c354f8da0d2.pdf?index=trueIn PDF document text
    • http://linanimeb.rf.gd/emergency_medicine_physician_assistant.pdfIn PDF document text
    • https://6f12065f-c45d-410c-b048-6ec23fb2b810.filesusr.com/ugd/02ccf7_0d51990e674542b49f9066d3e8cc9d1f.pdf?index=trueIn PDF document text
    • http://belunovozexuse.rf.gd/vevawutimajejodowemiwan.pdfIn PDF document text
    • https://0c2a99dd-71fd-4a0d-b96f-672cfa785c21.filesusr.com/ugd/515c54_1f87cc699770458d9d01c7398526f615.pdf?index=trueIn PDF document text
    • https://5fdaa9e0-ad6d-443b-8779-beb8e45026dc.filesusr.com/ugd/05301a_49b8223ffbd24ce98629950a4aa3b222.pdf?index=trueIn PDF document text
    • https://0298dc5a-7924-4276-8279-06452a5288da.filesusr.com/ugd/b30cf0_4d4e0adcc07f4e9cb30807e704b4f914.pdf?index=trueIn PDF document text
    • http://bidusopevix.epizy.com/tinemomesagetesukef.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_off0000dc90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC90 5060 bytes
SHA-256: 066d437735b54d228ca3b535cdc64948d8d8336d54c828eac7166dda3ec92a7c
font_01_sfnt_off0000ede9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE9 10616 bytes
SHA-256: 0d20db29af69ab695430649d0676f518e735f4eee06070a09d73ae04e19b6430