Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c9e101991c8f8fb…

MALICIOUS

PDF

65.3 KB Created: 2021-03-20 07:17:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 31c13612661adab5e1e36ff252f2549d SHA-1: 53136eecb3f91a0289adb26cf331b42587400517 SHA-256: 6c9e101991c8f8fbfda5f7a7d1d02548a7d453066d26b55f8453333b24e92a4a
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, suggesting it acts as a link farm or a lure for phishing or malware downloads. The presence of a 'download button' heuristic further supports the idea that the document is designed to trick users into initiating a download, likely leading to a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://leonvi.ru/award?keyword=biblia+vanzarilor+jeffrey+gitomer+pdf PDF link annotation
    • http://linekiwugomevas.22web.org/roland_fa_6_black.pdfIn PDF document text
    • http://zikewexer.scienceontheweb.net/burdens_are_lifted_at_calvary_lyrics.pdfIn PDF document text
    • https://segamivudafipem.weebly.com/uploads/1/3/2/7/132740242/9618576.pdfIn PDF document text
    • http://gopumapi.iblogger.org/21726515602.pdfIn PDF document text
    • http://xonibiz.22web.org/art_yasmina_reza_franais.pdfIn PDF document text
    • https://xavimunemu.weebly.com/uploads/1/3/2/8/132815343/wudosasizuwob_zomokexana_wasudiro.pdfIn PDF document text
    • http://nipokaxa.getenjoyment.net/kidde_smoke_alarm_keeps_beeping_with_new_batteries.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nijarigu.onlinewebshop.net/jawedolosu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8c411f3-196a-4cb9-89fc-bbe7cc0aedc8/the_mandalorian_cast_episode_4.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3da69939-7e54-4e9f-bc56-378775561ae9/80481399710.pdfIn PDF document text
    • http://pekomuvave.myartsonline.com/16709168730.pdfIn PDF document text
    • http://kozogasivufi.myartsonline.com/bugera_v22hd_infinium_manual.pdfIn PDF document text
    • http://lezapogitoda.rf.gd/52219141819.pdfIn PDF document text
    • http://xujekapowizi.epizy.com/diy_paper_bow_tie_template.pdfIn PDF document text
    • http://mukexojot.rf.gd/18230514996.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c5848d6-e073-47f5-95bb-4a243e4b5023/42949848512.pdfIn PDF document text
    • http://nejoman.rf.gd/fenogu.pdfIn PDF document text
    • http://kadoxosin.atwebpages.com/how_to_release_psoas_with_ball.pdfIn PDF document text
    • http://wubalele.rf.gd/42037689885.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_off0000c1c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1C8 5660 bytes
SHA-256: 19bd0f6c42a88b91d6354f7dbebd39ce6cba62ee84a0cc2d391d7bfe73d5f35c
font_01_sfnt_off0000d516.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD516 10284 bytes
SHA-256: 26bac0124703c3b03927dcc03746c3006ba3a427c044db9eb313702b35fc94fb

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