Malicious PDF — malware analysis report

Static analysis result for SHA-256 d81b42b6bea98ef3…

MALICIOUS

PDF

77.0 KB Created: 2021-05-20 11:26:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 937009b23e7b98df79e302f889f7b82f SHA-1: 794d7a52d228f52d2d1f4596bcaac8a2c1b98439 SHA-256: d81b42b6bea98ef36a0970e2fad6a3207593c8c7f93b8a8ebaeb8fcde29ef6be
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by a machine learning classifier and ClamAV, indicating it is likely a phishing or trojan delivery mechanism. The PDF contains a large number of external links, suggesting a link farm or SEO poisoning tactic to attract victims searching for specific content. The primary malicious URL identified is https://xajibur.ru/strik, which is likely used to serve a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://xajibur.ru/strik?utm_term=world+time+magazine+june+2020+pdf+download PDF link annotation
    • https://gupifamerimim.weebly.com/uploads/1/3/4/1/134132082/mupek.pdfIn PDF document text
    • https://wabirigiraziw.weebly.com/uploads/1/3/6/0/136017191/51b9ecebc465510.pdfIn PDF document text
    • https://zavowije.weebly.com/uploads/1/3/2/6/132680855/gugupunovufi.pdfIn PDF document text
    • https://tekagegi.weebly.com/uploads/1/3/2/7/132740997/wobozalobuvolo-zojifur-lisez-bigej.pdfIn PDF document text
    • https://nunezujotegu.weebly.com/uploads/1/3/4/3/134312528/399888.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/pukiza/female_long_to_short_haircut_stories.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a41e895-ab9a-4caf-9545-11a17dbde58a/xosuwisodisifelufid.pdfIn PDF document text
    • https://s3.amazonaws.com/wudibirewuduto/akai_professional_apc40_mkii_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/resabomibogodaw/19478405230.pdfIn PDF document text
    • https://s3.amazonaws.com/bezutu/mesusidaf.pdfIn PDF document text
    • https://s3.amazonaws.com/rutufokedizon/voxabozikimiduxazamon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f26ae95-aa9d-4621-9e85-94119f5b9045/what_was_king_davids_real_name.pdfIn PDF document text
    • https://s3.amazonaws.com/fidefofudi/depulajipejaluwefibi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a69d7bc5-7cab-4ccf-99d5-5690c826505f/63455759632.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eab5e7f1-c2b8-4539-b9b3-0b4648b1f1c6/vawasajotimusugopoferipab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05c58433-1e9f-4ff4-a9ed-cac460bfead2/kemare.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d77f250a-e3f3-47c8-ad8c-44e00c90e9c7/83066676581.pdfIn PDF document text
    • https://s3.amazonaws.com/jolunenafobuw/34162043928.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1fa0e931-71bd-4cfc-ae5b-4b9ffe59ebb7/tabaki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/039b0a01-2976-4191-a3d2-cf4af805bad1/what_is_the_closest_synonym_for_progressive_tense.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e0e47a5-05f3-4622-908a-98eb792ccc7e/40029894938.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_off0000ebe9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE9 5688 bytes
SHA-256: f761a66759785e448152b80888181534f848cc318f118b9536b8de937b0d77bf
font_01_sfnt_off0000ff51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF51 10908 bytes
SHA-256: 476a2c39661735a9ea89e496a3bfd11578614fb1048f421d831b49b8f5cf35e4

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