Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc1f8cbb09aa6872…

MALICIOUS

PDF

94.6 KB Created: 2021-04-06 14:09:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: f3ade227c2b097238b283285f06047ea SHA-1: 8bb9691cad90c6d4528e2878abf58789993ed555 SHA-256: cc1f8cbb09aa68726236ef1ec5440f1aaf05bb8d553081bae0ea94bc0ab9590c
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 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xezojetit.ru/strik?utm_term=dhl+global+mail+tracking+number+example PDF link annotation
    • https://mubuzetuwifo.weebly.com/uploads/1/3/4/7/134703000/savanido.pdfIn PDF document text
    • http://tevoriveterusof.22web.org/gedepiveberilepijozufi.pdfIn PDF document text
    • http://nidikasuzarola.iblogger.org/fokadavekujipekamo.pdfIn PDF document text
    • https://pimetagedipimop.weebly.com/uploads/1/3/1/6/131636886/3798648.pdfIn PDF document text
    • https://vukibipodut.weebly.com/uploads/1/3/4/6/134690361/bewifikaba-defudedel.pdfIn PDF document text
    • https://nixejinalir.weebly.com/uploads/1/3/4/3/134321479/874b3dc421e1.pdfIn PDF document text
    • https://moforikegumiret.weebly.com/uploads/1/3/2/6/132680993/6e75e40.pdfIn PDF document text
    • https://zegirapenutiv.weebly.com/uploads/1/3/4/3/134393596/5d267e8f34095.pdfIn PDF document text
    • https://fezapatinegu.weebly.com/uploads/1/3/4/2/134266508/magavatemopeje.pdfIn PDF document text
    • https://kidamevu.weebly.com/uploads/1/3/1/4/131437276/6171296.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6d706a39-1f93-4f1a-9423-caccf7e65e71.filesusr.com/ugd/69f91f_7e826af212fe40878f7a5bd9658d89c7.pdf?index=trueIn PDF document text
    • http://gejagixuz.epizy.com/ecc_cryptography.pdfIn PDF document text
    • https://9de673a2-3b8e-40eb-bbf5-c0ad8e71a3da.filesusr.com/ugd/bd5c68_13b4456012aa4985b0d0a659e6f2fbf8.pdf?index=trueIn PDF document text
    • http://fujifumava.epizy.com/41910669351.pdfIn PDF document text
    • http://sutuvufekejute.epizy.com/ralikazot.pdfIn PDF document text
    • https://5c817321-7c0c-448b-959d-deb1da9fd788.filesusr.com/ugd/19103d_13e0252fb59d4510accf91def32bd7e7.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_off00013696.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13696 5440 bytes
SHA-256: 7d15b2dff7ecc1171cf9d266f01f3726e1ba8c717deb97ac414fe020f3a43a4e
font_01_sfnt_off000148fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148FA 10692 bytes
SHA-256: eb26af1c96fd53f2c47c2abfadbdd005e5609a4429c39c8a4cbd864d665378ae

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