Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbc355479b93d668…

MALICIOUS

PDF

75.8 KB Created: 2021-03-01 11:34:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 07fc194d909a1978b47b7feab1652b8d SHA-1: 41fd782355862e8c81c0bfe4275cc2c324c10499 SHA-256: dbc355479b93d668b0d17ab887b09e5b110eea15e156eb2625fd57a62ed624da
156 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9906

Heuristics 5

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://mezovuduw.ru/strik?utm_term=best+essential+oil+recipe+books PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4496381/normal_5ff3cfae8bc1f.pdfIn PDF document text
    • http://rejasikega.scienceontheweb.net/automatic_stitching_machine_for_book_binding.pdfIn PDF document text
    • https://zaporori.weebly.com/uploads/1/3/4/1/134131460/tuvugumawulekamodiv.pdfIn PDF document text
    • https://mokizafot.weebly.com/uploads/1/3/5/3/135347773/d24ea.pdfIn PDF document text
    • https://wemezixogasowed.weebly.com/uploads/1/3/1/6/131637562/45b00a6.pdfIn PDF document text
    • https://jazaxalik.weebly.com/uploads/1/3/4/4/134488577/1201598.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411498/normal_602535de3f4b1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470533/normal_5fed45b08a58a.pdfIn PDF document text
    • http://vivekawiga.sportsontheweb.net/70012470667.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456143/normal_601f308d11ebe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384645/normal_60247647c8f84.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/lekizopiloref/rodufulomiwokefikidowu.pdfIn PDF document text
    • https://s3.amazonaws.com/pokorevalaxex/onkyo_tx-nr515_firmware_update.pdfIn PDF document text
    • https://s3.amazonaws.com/wupixufekijax/anglican_churchwardens_report.pdfIn PDF document text
    • https://s3.amazonaws.com/gifojuxaxeva/jesifisokudenovofi.pdfIn PDF document text
    • http://muzulozak.atwebpages.com/wedesozumuraxudez.pdfIn PDF document text
    • https://s3.amazonaws.com/jutenojamega/32971567990.pdfIn PDF document text
    • https://s3.amazonaws.com/goneduzum/86416982498.pdfIn PDF document text
    • https://s3.amazonaws.com/ginutu/english_to_spanish_common_words.pdfIn PDF document text
    • https://s3.amazonaws.com/napejaxosinages/xitunajuxelupazi.pdfIn PDF document text
    • https://s3.amazonaws.com/pewebopufupe/16591472455.pdfIn 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_off0000f787.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF787 5180 bytes
SHA-256: e7b27eb32ecdeba5e692c33a6f3d9b6b098204e96b89dba65a7efa0c970d9ca6
font_01_sfnt_off00010934.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10934 10180 bytes
SHA-256: a6551a5fe53554d7fbb5dcab210b2215db823583086c628f2fd172997a422e9a

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