Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8f3c69171134ae1…

MALICIOUS

PDF

67.8 KB Created: 2021-01-30 22:33:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 8bd9adcbaaebeb05cf870c403ce62f4d SHA-1: 7addf2d8a51f7b7a513d1638d365dd2e5c4c3422 SHA-256: b8f3c69171134ae1611cb197b70d534618b24670c4725b6b4828359a5c910c7d
156 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, indicating a phishing or malicious intent. The heuristic 'PDF_SEO_LINK_FARM' suggests the document contains a large number of external links, likely to manipulate search engine results or direct users to malicious sites. The presence of embedded URLs further supports this, with one prominent URL being https://maypoin.ru/123?utm_term=infinity+kappa+6x9+amazon. No scripts were extracted from this sample, but the overall structure points to a phishing or SEO spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://maypoin.ru/123?utm_term=infinity+kappa+6x9+amazon PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4495997/normal_5fdf16c1a1aec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379733/normal_5fe8ecc772f1d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446379/normal_5ff1f868547a2.pdfIn PDF document text
    • https://ribofefafuf.weebly.com/uploads/1/3/4/7/134770843/nivamugenibiv_falomi_tumakagelufad.pdfIn PDF document text
    • https://bipovubukixepev.weebly.com/uploads/1/3/2/7/132740720/d28dd66f9d2e05.pdfIn PDF document text
    • https://doxazefeseremef.weebly.com/uploads/1/3/4/7/134764644/seluxozakamowe_nifep.pdfIn PDF document text
    • https://duzareledibasa.weebly.com/uploads/1/3/4/8/134890493/cfba01d232527b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446026/normal_5fcd9c032a582.pdfIn PDF document text
    • https://wexabegolorumad.weebly.com/uploads/1/3/4/3/134351445/nexiwis-mujuponoxotifer-sobozudoka.pdfIn PDF document text
    • https://kujibolivobukib.weebly.com/uploads/1/3/1/1/131163991/pidusuriri.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445532/normal_5fd796ec6316b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416144/normal_5fe3c3712d68f.pdfIn PDF document text
    • https://guxofoxevi.weebly.com/uploads/1/3/4/7/134737998/f30eaf9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466154/normal_5fd7d037b9cef.pdfIn PDF document text
    • https://dibotora.weebly.com/uploads/1/3/4/8/134870334/butejuwobowikef_vafusemezifaf.pdfIn PDF document text
    • https://buseziji.weebly.com/uploads/1/3/1/3/131398529/3e64bd8d97ae.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c2e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2E6 4940 bytes
SHA-256: 88c23895137f1724fdb5333946b08b0f7c7e476b25cdc7fb6e6541fb3754da35
font_01_sfnt_off0000d3a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3A8 9560 bytes
SHA-256: 3b28faf6793795156b749938058fd141b1c99fe020db6f9a7c3b7a2d466a268c
font_02_sfnt_off0000f444.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF444 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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