Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b7d092ca0f75cf9…

MALICIOUS

PDF

79.1 KB Created: 2021-05-04 06:42:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: cd2a4d9235ea8ebf11002e5f7f8b2a7e SHA-1: 4b598c71109721d07752be1cb5697cc1acaa155e SHA-256: 3b7d092ca0f75cf9ffd1a2f827ee4d5522da2b4d7aaa5e9f89245b037f771926
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to PDF files hosted on services like Weebly and S3, suggesting a link farm or redirection mechanism. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external URIs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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.
  • 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://nipisod.ru/strik?utm_term=family+feud+board+game+play+online PDF link annotation
    • https://joxedobiwot.weebly.com/uploads/1/3/5/3/135350216/xekakeba_bumubisoxore_xurenip.pdfIn PDF document text
    • https://cdn.sqhk.co/naxisedomak/5gevWQl/75603081152.pdfIn PDF document text
    • https://piramejujidizek.weebly.com/uploads/1/3/4/6/134694247/gibaloradalidajogi.pdfIn PDF document text
    • https://cdn.sqhk.co/tavimuxeju/iDeFZjh/black_desert_online_sea_can_t_client.pdfIn PDF document text
    • https://cdn.sqhk.co/rigizisojix/NjizIid/download_mod_game_zombie_hunter_king.pdfIn PDF document text
    • https://kisezuxuromo.weebly.com/uploads/1/3/0/7/130776201/sokisis.pdfIn PDF document text
    • https://befewegumezozem.weebly.com/uploads/1/3/1/4/131453636/644333.pdfIn PDF document text
    • https://cdn.sqhk.co/vusabutam/Nhjichd/jigugomolifurur.pdfIn PDF document text
    • https://cdn.sqhk.co/rorajakura/GjbvAia/zuzubodalorosativaxot.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb1d6e02-01b8-4f1b-8e60-21b98ded705c/modern_indian_history_timeline_upsc.pdfIn PDF document text
    • https://s3.amazonaws.com/gekojulog/negom.pdfIn PDF document text
    • https://s3.amazonaws.com/webipejonavuv/porter_cable_6902_router_for_sale.pdfIn PDF document text
    • https://s3.amazonaws.com/sonutopexaramuf/36113103040.pdfIn PDF document text
    • https://49b7c339-fea6-4bb3-bf7b-ca47af5263df.filesusr.com/ugd/6ca12d_a09a81ffd25f4bb88ce9de01a5046017.pdf?index=trueIn PDF document text
    • https://08b4a39d-fa16-4eaa-91be-ae90003cacb9.filesusr.com/ugd/237bf7_b024781805674ab79d42b55474b0b013.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee6ff62a-77e7-4109-bf95-102a45cd9b43/vokeradof.pdfIn PDF document text
    • https://s3.amazonaws.com/bidivo/best_dance_dj_music.pdfIn PDF document text
    • https://d4f4546a-a836-4b3d-8651-c56b89608eca.filesusr.com/ugd/3e9e83_fcd49c8d14594f1b8bc5decc8622d711.pdf?index=trueIn PDF document text
    • https://3d7304b5-8527-495f-b913-615d6f357a43.filesusr.com/ugd/ef7486_8387030922944ac4ad9d76633546aa9d.pdf?index=trueIn PDF document text
    • https://abf133a7-37c0-4616-b653-d99fd306bce3.filesusr.com/ugd/5c8236_2361f22ffbe14ae0b67d261bef083253.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wetowuzuxit/how_much_does_staples_charge_to_fix_a_computer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/033a190c-d1bd-48c6-abaf-a97568790e36/razukivexef.pdfIn PDF document text
    • https://a86a6b26-b473-4b55-b9aa-7628a2bff077.filesusr.com/ugd/4f270c_d5d64dee44fd43798f2c1a57c001c17d.pdf?index=trueIn PDF document text
    • https://b860438a-ced3-4995-86f2-ad9a24e3f15c.filesusr.com/ugd/938eb2_acbe9c22f70a4addb6b42ae86422e78b.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f6bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6BD 5380 bytes
SHA-256: 11a9de3050ffb539672ec5975c4c835e7f9b47890d65593c28b2c800bfa74063
font_01_sfnt_off000108ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108FF 11184 bytes
SHA-256: d05acfbe6961467ca8230811f5712b582e72fa2af109f98279574b00409f0d35