Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2cdbe62df494225…

MALICIOUS

PDF

95.2 KB Created: 2021-04-09 03:20:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: bda3e0555e53d2b939d701e6b8f93c39 SHA-1: dbdb0825f82329640bd46ba9acfe28f0fcf61a6d SHA-256: b2cdbe62df49422525cc58cf4978a16463d05952fefafdd05c34ff4459171302
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links pointing to other PDF files hosted on various domains, many of which appear to be disposable. This behavior is characteristic of a link farm, often used for SEO manipulation or to distribute malicious payloads. The ML classifier and ClamAV detection strongly indicate malicious intent, with the PDF being identified as a phishing trojan.

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://nipisod.ru/strik?utm_term=the+seven+spiritual+laws+of+success+a+practical+guide+to+the+fulfillment+of+your+dreams+summary PDF link annotation
    • http://cardioactiveuficiale.site/41503486903twcwj.pdfIn PDF document text
    • http://soldonlittleton.com/makufalemuvia75v0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484356/normal_6058449f2ce59.pdfIn PDF document text
    • http://sungo1.space/different_forms_of_energy_healing0k83c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493890/normal_5fe456152a9e0.pdfIn PDF document text
    • http://lazirawolewok.getenjoyment.net/calendrier_2020_algerie_avec_jours_fris.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454419/normal_6055a4878dae4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368956/normal_6013892b58de8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454545/normal_60663c13bfc7f.pdfIn PDF document text
    • http://vifezitenof.getenjoyment.net/andrew_ng_book_machine_learning.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464532/normal_60100333798a7.pdfIn PDF document text
    • https://kulojimafad.weebly.com/uploads/1/3/4/5/134518235/f08fecf5.pdfIn PDF document text
    • http://intekzafast.online/lizisiviferava2upq5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484804/normal_6029fb32350d6.pdfIn PDF document text
    • https://genebametujo.weebly.com/uploads/1/3/4/9/134904617/6c3b0aa74c9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465131/normal_600d232fba12e.pdfIn PDF document text
    • http://xokijaxano.medianewsonline.com/de_broglie_wavelength_formula.pdfIn PDF document text
    • http://pumba-timon.space/msi_h81m-p33_ram_supportkv17k.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452861/normal_600a4cd7c47d7.pdfIn PDF document text
    • http://fejiximodanu.mygamesonline.org/bbc_compacta_class_11_english_answers.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://64b67c6e-fbbd-4787-add8-9ed3e274c95c.filesusr.com/ugd/eb6612_b5bbe167d3bf480ea95e90abbaad42da.pdf?index=trueIn PDF document text
    • https://7a512b58-7189-4bc4-8343-f643fa9054c9.filesusr.com/ugd/1e52da_1a3786012e674016a12409108792105e.pdf?index=trueIn PDF document text
    • http://tijuvewoduga.onlinewebshop.net/todeluzebu.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_off0001348e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1348E 5772 bytes
SHA-256: dfef71ea89d8b9e93b7d146489a63cef4a0be2a35508ed6a38d95c696f06cdcd
font_01_sfnt_off0001481d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1481D 11176 bytes
SHA-256: 0bdf86e74f7c75e5d02ddb3b3356c36127f41aeb166337b79026cf233afbaf42