Malicious PDF — malware analysis report

Static analysis result for SHA-256 e933c4609333430b…

MALICIOUS

PDF

77.2 KB Created: 2021-04-07 02:04:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 4e91308dc3949723c1a020836bb3dffe SHA-1: 8a7100a0ca18597d41a1db4714b37e637c3c4a40 SHA-256: e933c4609333430b362b45a21eb5dbda1fd2de5a8c71c30f2ba3cab3108a5f00
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to Weebly-hosted PDFs, suggesting a link farm or distribution network. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards the exploitation of PDF vulnerabilities or social engineering to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://druttle.ru/123?utm_term=free+piano+sheet+music+my+favorite+things PDF link annotation
    • https://rugovisatef.weebly.com/uploads/1/3/2/6/132682701/1a500a0a11e0.pdfIn PDF document text
    • https://vupagujisixo.weebly.com/uploads/1/3/4/9/134904753/fa5d1ce.pdfIn PDF document text
    • https://sokirokesavosa.weebly.com/uploads/1/3/4/9/134901907/1192384.pdfIn PDF document text
    • https://defelidiko.weebly.com/uploads/1/3/1/0/131070982/xuboramupiraduv_negasilajili.pdfIn PDF document text
    • http://weinmvc.net/diccionario_espaol_latinoamericanoqah99.pdfIn PDF document text
    • http://persequen.com/how_long_does_a_sodastream_cylinder_last88jqi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449001/normal_60559a7687d82.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480758/normal_6044969d99ce9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411944/normal_601a3ff0bc08d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478669/normal_600cff6d32edd.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/leteraxewe/batla_house_full_movie_video.pdfIn PDF document text
    • https://s3.amazonaws.com/kevava/xekowodogo.pdfIn PDF document text
    • https://s3.amazonaws.com/wizitifowubux/83196775124.pdfIn PDF document text
    • https://s3.amazonaws.com/nitatotol/2003_jeep_liberty_oil_type.pdfIn PDF document text
    • https://s3.amazonaws.com/dikobepibelun/how_to_adjust_citizen_chronograph_watch.pdfIn PDF document text
    • https://s3.amazonaws.com/mupukesunobaga/tanotirakadumovemibiziru.pdfIn PDF document text
    • https://s3.amazonaws.com/xupovobejanam/30432416745.pdfIn PDF document text
    • https://s3.amazonaws.com/lolaritemukole/dell_inspiron_1720_usb_drivers.pdfIn PDF document text
    • https://s3.amazonaws.com/rijaliwiguvex/twitter_videos_won_t_play_on_android.pdfIn PDF document text
    • https://s3.amazonaws.com/wesezuzuvalirik/c_group_railway_form.pdfIn PDF document text
    • https://s3.amazonaws.com/wuwabobujasivor/14442306637.pdfIn PDF document text
    • https://s3.amazonaws.com/wusigipufuvowix/domaja.pdfIn PDF document text
    • https://s3.amazonaws.com/bokelur/holsworthy_cattle_market_report.pdfIn PDF document text
    • https://s3.amazonaws.com/nabifovu/budget_excel_template_free.pdfIn PDF document text
    • https://s3.amazonaws.com/liwara/joginofukuranuwu.pdfIn 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_off0000efb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB4 5512 bytes
SHA-256: 850eb4cef317436df3132ab0c9c880e6b239b5796e5e29838678f58e012f8ef0
font_01_sfnt_off0001025e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1025E 10704 bytes
SHA-256: 211d4829d6885f581cdd17d44038022ad3814f9a0319d2b669e575a516daf733

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