Malicious PDF — malware analysis report

Static analysis result for SHA-256 6227d735c16fca68…

MALICIOUS

PDF

77.7 KB Created: 2021-03-31 23:07:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: e746e5511117f9a94829c42aa2107541 SHA-1: 036f13d9c9661786faabbc5ceaca0b6368f0e74f SHA-256: 6227d735c16fca68f4d1e3702752d5001a3fa6d83679ff048cc18e756627ab4c
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, with one prominent URL pointing to a suspicious domain ('resalured.ru') that is likely used for phishing or distributing malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, classifying it as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious sites, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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
  • 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://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
    • http://www.daltonmaag.com/In 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://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_off0000e76b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE76B 4620 bytes
SHA-256: 0556b0b5aaab50ca9de6673db10fdb2784b8d7bf2a24aa1b0115cbc7d34c88e4
font_01_sfnt_off0000f711.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF711 10660 bytes
SHA-256: 59181f467455c6d2a13f78444cb4ec3f0df6d69206376b60318e6c478c0a3919
font_02_sfnt_off00011b7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B7A 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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