Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b7f5bb3b24f18a0…

MALICIOUS

PDF

81.3 KB Created: 2021-06-12 16:53:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 39fe05b9b015b579ea1b87cce70c3d13 SHA-1: c0fea48d9321de3f135be377be4be4cfec55b775 SHA-256: 9b7f5bb3b24f18a010d2bbfdbf609ee29da57b266c2818c6592e5185bc06e363
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO spam. While no scripts were explicitly extracted, the presence of numerous external links suggests an attempt to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://huntic.ru/pbw?utm_term=how+to+get+grass+seeds+terraria
    • https://cdn-cms.f-static.net/uploads/4387819/normal_603793724d7a9.pdf
    • https://cdn-cms.f-static.net/uploads/4390382/normal_601d9c5e7c4b9.pdf
    • https://dofenerezi.weebly.com/uploads/1/3/4/4/134446603/a9c3c85.pdf
    • https://pabibajezejav.weebly.com/uploads/1/3/5/3/135323938/durujesiwimaluv_buvurefawotug_fogarazukegunab_vokomekosujo.pdf
    • https://cdn-cms.f-static.net/uploads/4388272/normal_6037ccd6ac7dd.pdf
    • https://cdn-cms.f-static.net/uploads/4471706/normal_6045ffbea1494.pdf
    • https://cdn-cms.f-static.net/uploads/4469104/normal_60c263d7d1bc1.pdf
    • https://diforugagok.weebly.com/uploads/1/3/2/7/132741100/4878812.pdf
    • https://pepibugogik.weebly.com/uploads/1/3/1/0/131069762/popumaxakalu.pdf
    • https://rudixesawemes.weebly.com/uploads/1/3/1/1/131163949/xudofasapemikulaxudi.pdf
    • https://gogozugibijom.weebly.com/uploads/1/3/4/3/134369614/3754637.pdf
    • https://cdn-cms.f-static.net/uploads/4444864/normal_601ae8664e442.pdf
    • https://cdn-cms.f-static.net/uploads/4459640/normal_60c3d9a7a248f.pdf
    • https://dawofatodir.weebly.com/uploads/1/3/4/7/134756430/besarep_moduno_wikibo.pdf
    • https://pijatopug.weebly.com/uploads/1/3/5/3/135303623/kimojevaxemologu.pdf
    • https://static.s123-cdn-static.com/uploads/4480904/normal_60017bfbc9b01.pdf
    • https://vetenejoxo.weebly.com/uploads/1/3/1/3/131379321/bb88091.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://lugozamuxika.pbworks.com/w/file/fetch/144421467/how_to_increase_girth_size_fast.pdf
    • http://jowugaredite.pbworks.com/f/wii_sports_resort_pc_download.pdf
    • http://tomabekaf.pbworks.com/f/all_smash_ultimate_dlc.pdf
    • http://zolunegoli.pbworks.com/w/file/fetch/145128804/mca_middle_class_abbayi_mp3_songs_download.pdf
    • http://wenitudodub.pbworks.com/w/file/fetch/145084959/dnd_5e_create_character.pdf
    • http://kufugaref.pbworks.com/f/pazegibizezelotowalisib.pdf
    • http://faxofapuf.pbworks.com/f/tm-ac1900_firmware_2020.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_off00010324.bin
3436617675ac7c15ab9d88cb86854f7e6dff12f9b30d15170d4eae78274bffe7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10324 5016 bytes
font_01_sfnt_off00011453.bin
94c226ec275583226aa0f7550476b6c3e5ef88d3280bd25200139e37690ffbbb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11453 10428 bytes

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