Malicious PDF — malware analysis report

Static analysis result for SHA-256 90dbc2c87c523cf0…

MALICIOUS

PDF

102.3 KB Created: 2021-04-23 00:53:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: b217f45c0b55bb87d5ca9aff8bd3c7c3 SHA-1: 5f8672f9027150a4d6d0d1ac6fb0da766f27418f SHA-256: 90dbc2c87c523cf0aa36718e2e99c54b8bbba6f79f526292fb398619458a95e2
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for distributing further payloads or redirecting users to malicious sites. While no scripts were explicitly extracted, the PDF structure and numerous external URIs are indicative of a malicious document designed to lure users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://bologen.ru/strik?utm_term=what+are+the+effects+of+textual+aids PDF link annotation
    • http://jizerigozigalav.getenjoyment.net/analytical_reasoning_practice_test.pdfIn PDF document text
    • https://bopazexujow.weebly.com/uploads/1/3/4/8/134876268/gomutugazob.pdfIn PDF document text
    • https://depumubawaminuk.weebly.com/uploads/1/3/4/2/134236244/d809ec.pdfIn PDF document text
    • http://libunekuba.iblogger.org/67179589986.pdfIn PDF document text
    • https://vuguzunorofina.weebly.com/uploads/1/3/4/3/134322364/toxokinukopetuxami.pdfIn PDF document text
    • http://tiriruno.sportsontheweb.net/14910289418.pdfIn PDF document text
    • https://rodironamo.weebly.com/uploads/1/3/5/3/135347674/rajanuzufabikudow.pdfIn PDF document text
    • https://xonujofepip.weebly.com/uploads/1/3/4/3/134385468/2745d8800cb7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://2a009ac4-5770-49f2-ae16-4ce107243443.filesusr.com/ugd/59deca_0e6a867bc2e24d669a2e209308cc16c6.pdf?index=trueIn PDF document text
    • https://0298dc5a-7924-4276-8279-06452a5288da.filesusr.com/ugd/b30cf0_b0fdad4da3494655802594160034b03f.pdf?index=trueIn PDF document text
    • http://sanaxumidi.epizy.com/16661721327.pdfIn PDF document text
    • http://gotevamevilu.epizy.com/catholic_bible_in_urdu_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/gurupixabogivaz/mitsubishi_air_con_remote_control_manual.pdfIn PDF document text
    • https://19a39513-20cc-49d1-a75c-e30ce0314142.filesusr.com/ugd/f99735_10ca9428e06a4593bc920b5f0ff726d8.pdf?index=trueIn PDF document text
    • http://fopekexu.epizy.com/kirepudofefixax.pdfIn PDF document text
    • http://vefujedubileb.epizy.com/used_car_bill_of_sale_template.pdfIn PDF document text
    • http://tazidafez.rf.gd/branchement_moteur_machine__laver_5_fils.pdfIn PDF document text
    • http://lodufuvu.epizy.com/kotajigijiradi.pdfIn PDF document text
    • https://s3.amazonaws.com/xupizewuxere/33735007446.pdfIn PDF document text
    • https://s3.amazonaws.com/wixamupelinere/blasterjaxx_all_songs.pdfIn PDF document text
    • https://s3.amazonaws.com/rimejiguvif/xojirifokakedovasib.pdfIn PDF document text
    • http://memaded.epizy.com/25437955871.pdfIn PDF document text
    • https://b1b0174c-961c-4936-87f6-765e1132391e.filesusr.com/ugd/6cf804_44ff75c81da24885850a668cc489bc4e.pdf?index=trueIn PDF document text
    • https://4a39c6c9-989b-4d11-b2d8-cc0becc7f193.filesusr.com/ugd/ef0078_5a38e09689934a58a1de0eb7701fabb6.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014e89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E89 5188 bytes
SHA-256: 147a655193cd8baf5754c68fc0f20685779835929c15ffb62a375c6076104674
font_01_sfnt_off00016039.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16039 12644 bytes
SHA-256: 18e76d551f54230071a517b98d9b0561ac8934d87d3c344d14610723cabab847