Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fc51c940addec3a…

MALICIOUS

PDF

78.9 KB Created: 2021-03-28 01:35:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1aeb9905c8a831851b00afe7139e27a6 SHA-1: ec167682b2bf9adc77ad69678ee29ca13ea0ea9c SHA-256: 6fc51c940addec3a5d8a1ac3e43696cc7937ec973275678e658910cf9be00a99
156 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 it is likely a phishing or malware distribution lure. It contains a large number of external links, many pointing to PDF files, suggesting a link farm or redirection mechanism. The primary IOCs are the numerous URLs embedded within the document, which are likely used to redirect users to malicious sites.

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=bohr+model+of+atom+pdf
    • http://gekodejevotug.medianewsonline.com/sivesaxamokudo.pdf
    • http://beviluxenumiliv.mywebcommunity.org/test_for_anions_and_cations_table.pdf
    • https://wemawamirake.weebly.com/uploads/1/3/5/9/135959397/pukom.pdf
    • http://kexedeziferu.sportsontheweb.net/mabafopevanix.pdf
    • http://bufo.online/learn_sumerian_languageyfpyr.pdf
    • http://libralab.digital/free_charity_event_program_templatefsqfm.pdf
    • http://larokamexi.sportsontheweb.net/21919229944.pdf
    • https://nefikeroliv.weebly.com/uploads/1/3/1/4/131453179/6276693.pdf
    • http://sogejovep.mypressonline.com/novela_doa_brbara_wikipedia.pdf
    • https://noxiwufozale.weebly.com/uploads/1/3/0/8/130814513/4316840.pdf
    • https://fuzewejobedogu.weebly.com/uploads/1/3/1/4/131482867/jelerorelaxaja.pdf
    • https://zanobevaduj.weebly.com/uploads/1/3/2/6/132682049/1810505.pdf
    • https://tetemubegogik.weebly.com/uploads/1/3/4/4/134443084/6945765.pdf
    • https://luzatewuxajexi.weebly.com/uploads/1/3/4/2/134265782/9f3eff2.pdf
    • http://volosaty100.xyz/crazy_train_flute_sheet_musicxyfxr.pdf
    • http://alphabitx.com/graphic_novels_for_7-8_year_oldsxfhxe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/40d37195-dd30-44f1-b1cd-c833d1f2e4da/rejokatitemabemep.pdf
    • https://uploads.strikinglycdn.com/files/ccdb9c1a-d08f-4555-b6d6-85468156b058/bimemiwoxanukejoxizuno.pdf
    • https://uploads.strikinglycdn.com/files/6e033d85-470e-4274-8ca3-26f060e4d42a/86813188229.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_off0000f5a4.bin
f4bf7063591a9d695fa69bbb2edd500ee9cfbed26cce79a62bd22628c6ba7a8c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A4 5152 bytes
font_01_sfnt_off000106fd.bin
dfca32f577b844676c7189db6384af535acfc2f7647fe5942028a52ceeda4f6c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x106FD 11896 bytes

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