Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd3531a3982ae82f…

MALICIOUS

PDF

71.7 KB Created: 2021-03-18 23:52:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 445b61cecf24de1db0ff679359c03c17 SHA-1: 2588d850a06eb37085bc803d2fcdf6604591bda7 SHA-256: dd3531a3982ae82febead31abae97ce80d96147796ec6f1438a2427de0a993ba
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are designed to appear as legitimate documents but lead to unknown or potentially malicious destinations. The heuristic 'PDF_SEO_LINK_FARM' indicates a deliberate attempt to create a link farm, and the ClamAV detection confirms its malicious nature. The embedded URLs are likely used to redirect users to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://pelibifir.ru/award?keyword=single+phase+induction+motor+speed+control+pdf
    • https://feposogasutam.weebly.com/uploads/1/3/1/3/131384530/6ca28c5.pdf
    • https://bolowarokarov.weebly.com/uploads/1/3/4/3/134349384/vusovuxidusopizub.pdf
    • http://jebumivusesujan.iblogger.org/shining_resonance_romance_guide.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://01dc7cc6-b8ed-446e-8cc8-1ad78882ed38.filesusr.com/ugd/e23fbb_80d71779e81c40dba7b6e86ea7772353.pdf?index=true
    • http://vipovavediv.rf.gd/the_austere_academy_weebly.pdf
    • https://51f47fa2-20f7-4ec4-bb91-8ae4aee689b4.filesusr.com/ugd/917232_f07bcac77f3c4b028fe91e0624fc7a8f.pdf?index=true
    • https://s3.amazonaws.com/ganubifirigevi/epwp_principles_and_guidelines.pdf
    • https://720c7b34-a033-4bf0-83ea-6be17de98aa2.filesusr.com/ugd/03ef8e_102b1f37e11445a6af926ceb1fff1688.pdf?index=true
    • https://s3.amazonaws.com/kofabube/luwatabatomeledog.pdf
    • https://s3.amazonaws.com/dovulavavo/60024222531.pdf
    • http://releboxodaw.rf.gd/appsc_group_1_syllabus_2020.pdf
    • http://tuwafexom.epizy.com/11605225001.pdf
    • http://resomaxijudutuw.epizy.com/fingerprint_attendance_system_project_report.pdf
    • https://s3.amazonaws.com/mozirolinitaje/el_cerebro_humano_libro_de_trabajo.pdf
    • https://e6676b24-921d-4f57-8fca-beda98688f3c.filesusr.com/ugd/144d27_1fffa71c8a234c30ba41356161e3dad7.pdf?index=true
    • https://s3.amazonaws.com/rodiligarexo/adobe_acrobat_vip.pdf
    • https://s3.amazonaws.com/vufuzewasi/tomozebutajusobuvi.pdf
    • https://s3.amazonaws.com/zesixefe/39602657813.pdf
    • https://s3.amazonaws.com/muvevanepen/4423424006.pdf
    • https://s3.amazonaws.com/zesotat/puviwapepalig.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000daec.bin
f8d7dcabb04b474714334616ef5776ebe304bce4572492ff073afeaf537e4f14		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDAEC 5672 bytes
font_01_sfnt_off0000ee09.bin
de41b6057db62b0bacbc56e63faade81e3ee08075538e8c25faf5c70416cddd0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE09 10236 bytes

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