Malicious PDF — malware analysis report

Static analysis result for SHA-256 333c2ccb3241284c…

MALICIOUS

PDF

87.5 KB Created: 2021-03-18 13:25:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: b18247f6badf6c3d0e8b61183788a96f SHA-1: 7aba177a5f9105940cec498fffe6f8d60a9e1f85 SHA-256: 333c2ccb3241284cec482526d7be0a5bbcbae42303fe4bc4edcdeebf6e162a61
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URIs are indicative of a malicious document, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 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.
  • 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.
  • 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://xezojetit.ru/123?utm_term=akinator+free+game+no PDF link annotation
    • http://pressit.fun/how_to_help_someone_who_is_stressedzv63n.pdfIn PDF document text
    • https://cdn.sqhk.co/kuregemuwu/gpvSZif/school_driving_3d_game_download_for_android.pdfIn PDF document text
    • http://brumbum3.xyz/19005732798xa6ya.pdfIn PDF document text
    • https://nawivavunof.weebly.com/uploads/1/3/4/6/134669961/dapuburagixunodipuwa.pdfIn PDF document text
    • https://cdn.sqhk.co/kupawusel/hcgccD9/snes9x_ex_games_download.pdfIn PDF document text
    • http://gmetry.online/chinese_cinderella_book_reportccsha.pdfIn PDF document text
    • http://fitokapss.xyz/zusaxigokedetayobuh.pdfIn PDF document text
    • http://chambrely.xyz/the_voter_chinua_achebe_questionstwilk.pdfIn PDF document text
    • https://vimedapajabapi.weebly.com/uploads/1/3/5/3/135309909/5758259.pdfIn PDF document text
    • https://bidefajiwi.weebly.com/uploads/1/3/4/0/134096082/niteduwawuvox-mojid-ruzorerutexole-pobifarakukow.pdfIn PDF document text
    • https://jeduwenerapowi.weebly.com/uploads/1/3/4/6/134678879/kujewuji.pdfIn PDF document text
    • https://fuxiwuzepideka.weebly.com/uploads/1/3/1/3/131381491/df831576f91.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/vesubodufisi/98534357860.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b514bbfd-b0ef-4955-a0fb-b78a3ae55eea/how_to_put_pad_on_swiffer_wetjet.pdfIn PDF document text
    • https://s3.amazonaws.com/pululusodogi/shimano_alfine_8_twist_shifter.pdfIn PDF document text
    • https://8d59741e-369e-44be-b01e-8fbcb09d2d01.filesusr.com/ugd/7cefa9_1c332d47a5ab4134a94265d1a8080822.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zerejibixupav/3051483539.pdfIn PDF document text
    • https://24b051fc-04af-4e2d-8b9e-4e75c06063ec.filesusr.com/ugd/1a488c_69560162ec7e4afd904ae9145089d131.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f01d3336-b802-4040-ad74-c70f8fe8ee42/41732246054.pdfIn PDF document text
    • https://s3.amazonaws.com/kevava/wulixoxivaromega.pdfIn PDF document text
    • https://d0570615-6cc6-4b78-9a9c-590639bc525b.filesusr.com/ugd/30850e_d164e728fb57409c99bca9fa046d72aa.pdf?index=trueIn PDF document text
    • https://070488ba-e3d9-4c74-834b-445551f5513c.filesusr.com/ugd/fb83f1_b1ce1b98c3eb469f960da7b2a9b365a4.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eade.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEADE 4932 bytes
SHA-256: 29b763c4a48c7ebb507aabd47cbcecf55d17c437aab5fd9eb68d2a734c8f350b
font_01_sfnt_off0000fb92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB92 8568 bytes
SHA-256: 646c516dbd160aefae492a2c0f6c3592418efde9a4b7823af43879471afe6b6a
font_02_sfnt_off00010d9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D9C 11364 bytes
SHA-256: 97b8a203dc3566b6d0f3d4cbbe125fd5c674a7e1422e19b05fe3dc78611a4ae4
font_03_sfnt_off0001349e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1349E 17880 bytes
SHA-256: b568d90461f1bb726453b7cfb4b13a37db60d987cd45d0d0e66b1441b4fe138c

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