Malicious PDF — malware analysis report

Static analysis result for SHA-256 be89cd83be63c58a…

MALICIOUS

PDF

62.5 KB Created: 2021-03-31 23:07:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 4a102a8af678f53498710bc7cbbfb730 SHA-1: 95cb6c8107d7dff0fd9dfd37f1a44152ffc2fe70 SHA-256: be89cd83be63c58ab34f3e643d655912b6652d5a498342d91b9b175bdba33daa
154 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for SEO poisoning or phishing campaigns. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, with one prominent example being a link to 'resalured.ru'. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9398

Heuristics 4

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://resalured.ru/award?keyword=jurnal+bivalvia+pdf PDF link annotation
    • https://pazijovipa.weebly.com/uploads/1/3/4/3/134327002/sonakerarurilasini.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486984/normal_6006ccdaa81bd.pdfIn PDF document text
    • https://bajozofexowabir.weebly.com/uploads/1/3/1/3/131398176/02f9566190e81b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492880/normal_603a3df156ae2.pdfIn PDF document text
    • https://nogalagamepet.weebly.com/uploads/1/3/0/7/130738620/sosasatatu-faxovaporexexap-mukowodan-wozolo.pdfIn PDF document text
    • https://jumirusuvowelu.weebly.com/uploads/1/3/4/6/134632856/piwunanota.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385647/normal_60126a2d31e8f.pdfIn PDF document text
    • http://trokot-shtorki.online/vetizatageno535or.pdfIn PDF document text
    • https://bilezebije.weebly.com/uploads/1/3/4/3/134344171/8631717.pdfIn PDF document text
    • http://oneplusonemain.xyz/tiruwekezesenij3o4ej.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422877/normal_5fcf428be3bdf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5862e4ea-63a6-4c92-af93-e06d02d1a664.filesusr.com/ugd/eaa371_344dfe925c7045da89f6b9a0e01e75a7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tolivajupeku/are_kohler_shower_heads_interchangeable.pdfIn PDF document text
    • https://s3.amazonaws.com/pesetufavo/car_will_shift_into_gear_but_will_not_move.pdfIn PDF document text
    • https://s3.amazonaws.com/jajuzasalikirut/24166619733.pdfIn PDF document text
    • https://171e2b11-24ea-4535-acac-f971ec821c4b.filesusr.com/ugd/a07927_0fc502afedec4f098e2cda61bd31bb38.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nojemi/mathswatch_answers_hack.pdfIn PDF document text
    • https://s3.amazonaws.com/lixisariwulo/craftsman_air_compressor_regulator_rebuild_kit.pdfIn PDF document text
    • https://a815f367-2516-4b88-9496-eed07d5c1eb7.filesusr.com/ugd/665c20_e38904c6016d4f879d10df4b430c61e2.pdf?index=trueIn PDF document text
    • https://58552d80-c20c-4e4f-99b9-91bedbcc07a3.filesusr.com/ugd/c18496_1e92d811c0214c6998674693f859a65e.pdf?index=trueIn PDF document text
    • https://3fb740b9-71d8-4183-8edb-de11b68c0a29.filesusr.com/ugd/1fbf8b_0b5f91815efa44428245b1d230c6b96d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dojonuta/firefawikedafim.pdfIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e76b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE76B 4620 bytes
SHA-256: 0556b0b5aaab50ca9de6673db10fdb2784b8d7bf2a24aa1b0115cbc7d34c88e4

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