Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c50d30cc82ee0d9…

MALICIOUS

PDF

70.9 KB Created: 2021-04-28 18:23:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: a2867cb42f12b4e404ae2bb32fa9f421 SHA-1: 2d0394094635e8c2b676eb8b881428a7b281216c SHA-256: 8c50d30cc82ee0d93096c5b67d629eb8e786400da06738587829d3c27388fea4
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. 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 0.9952

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://jottigo.ru/strik?utm_term=programmable+logic+controllers+kelvin+t+erickson+pdf PDF link annotation
    • http://smartcreditcheck.info/lotro_scholar_guidepgg44.pdfIn PDF document text
    • http://bitsracing.net/adobe_cs3_serial_numberzeegw.pdfIn PDF document text
    • http://grantmedica.ru/colegio_de_enfermeras_profesionales_de_honduras_direccionnw4hz.pdfIn PDF document text
    • https://sopidafepu.weebly.com/uploads/1/3/4/7/134744384/fepazetox.pdfIn PDF document text
    • https://lodobapidadisu.weebly.com/uploads/1/3/1/1/131164557/b1d76b66f7d0.pdfIn PDF document text
    • http://tajupodibo.iblogger.org/paris_arrondissements_map.pdfIn PDF document text
    • http://sbrf.link/top_gear_top_hot_hatchbacksyetpd.pdfIn PDF document text
    • https://gidutuzewefira.weebly.com/uploads/1/3/1/3/131380066/mitinusuzuzururelaxa.pdfIn PDF document text
    • https://vamawawu.weebly.com/uploads/1/3/0/8/130874524/7058062.pdfIn PDF document text
    • http://gelchlen.fun/56221523769glzav.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/kewuxejikiwe/seloxonexamatonosezirikut.pdfIn PDF document text
    • https://2e96d104-cacc-4af9-914c-411927af6089.filesusr.com/ugd/0f866b_0c50a85d361f4da98ef5acf0edad55a8.pdf?index=trueIn PDF document text
    • https://30b7777e-008d-46fe-a6a0-489223091328.filesusr.com/ugd/c345b0_5fdee39dff544ab18b81ce01ff0d9ab8.pdf?index=trueIn PDF document text
    • http://tojederetesez.epizy.com/90477089581.pdfIn PDF document text
    • https://s3.amazonaws.com/zuvovoxigumuz/how_much_is_a_half_chicken_at_boston_market.pdfIn PDF document text
    • https://s3.amazonaws.com/fotepopunaj/channel_7_eyewitness_news_new_york_reporters.pdfIn PDF document text
    • https://s3.amazonaws.com/timeziso/jalinogewobem.pdfIn PDF document text
    • http://wujasulo.epizy.com/vapas.pdfIn PDF document text
    • http://wurunuj.epizy.com/54599681211.pdfIn PDF document text
    • https://s3.amazonaws.com/gowebabuxogiro/social_psychology_10th_edition_aronson.pdfIn PDF document text
    • https://s3.amazonaws.com/bipovoromoj/94102650563.pdfIn PDF document text
    • https://9e9203d9-9f5b-42f2-a849-05e42d741f90.filesusr.com/ugd/3527d5_7d9c77848f9c4e40aa227ae2c26df52f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wexukufedepim/74685085874.pdfIn PDF document text
    • https://s3.amazonaws.com/ladojenefe/vegenimijasez.pdfIn PDF document text
    • https://8d2868a3-57b7-484c-81f6-493c1c4f5daa.filesusr.com/ugd/a8ca0f_ecc0f9d4f3c2415e8cb6d145bdd12f92.pdf?index=trueIn PDF document text
    • http://zevuketeno.rf.gd/zurugopesu.pdfIn PDF document text
    • https://s3.amazonaws.com/mikibetiv/something_just_like_this_lyrics_guitar_chords.pdfIn PDF document text
    • https://s3.amazonaws.com/kofabube/57899999702.pdfIn PDF document text
    • https://5090c2af-253d-40c3-bfb7-942fc6db26b0.filesusr.com/ugd/0511f5_835e0c42d9de4ba79130072edd7e174a.pdf?index=trueIn 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_off0000d675.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD675 5740 bytes
SHA-256: f24699f4d8d3c2eb51495c1b8b1781950c5d1ac0701d88da66763f27f7f6cd6b
font_01_sfnt_off0000e9f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F0 10216 bytes
SHA-256: 3badb0308e070cc4752bbe1c86d0b3a837d3054e3f3971dbda96e2325e75de2c