Malicious PDF — malware analysis report

Static analysis result for SHA-256 c55dacda6f782f48…

MALICIOUS

PDF

131.2 KB Created: 2021-01-09 19:02:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 49e41bf607f6c900c87b04f32786bc9e SHA-1: 76f9693f1911891824f0eb792bec8cebbe635477 SHA-256: c55dacda6f782f4808ed934a6c9ee3f961905f6660bc0bcf0047188a558b5152
164 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to S3 buckets, suggesting a link farm or a method to distribute further payloads. ClamAV detected this as Pdf.Phishing.Trojan, and ML classification strongly indicated maliciousness. The presence of embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' indicate a phishing or malware distribution attempt, likely using a lure related to 'bodybuilding wallpapers' as suggested by one of the URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://traffnew.ru/aws?utm_term=bodybuilding+1080p+wallpapers PDF link annotation
    • https://site-1174988.mozfiles.com/files/1174988/update_phones_custom_configuration.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406168/normal_5fea31c9b3ce4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367631/normal_5fad7c2ae1ca6.pdfIn PDF document text
    • https://site-1177330.mozfiles.com/files/1177330/munaruxa.pdfIn PDF document text
    • https://site-1178444.mozfiles.com/files/1178444/citizens_fcu_mobile_banking.pdfIn PDF document text
    • https://xomowozijirogap.weebly.com/uploads/1/3/4/6/134667332/34bae.pdfIn PDF document text
    • https://site-1175702.mozfiles.com/files/1175702/cake_maker_cooking_games_download.pdfIn PDF document text
    • https://depasosuva.weebly.com/uploads/1/3/4/4/134483816/dabe5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370309/normal_5f8855eb31864.pdfIn PDF document text
    • https://bebamewikirebu.weebly.com/uploads/1/3/0/8/130874540/7126046.pdfIn PDF document text
    • https://juvedolukojubis.weebly.com/uploads/1/3/2/6/132682904/sulirizudo_kizapefugomij.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/wixamupelinere/gubeguludezewuvetevoni.pdfIn PDF document text
    • https://s3.amazonaws.com/xozeb/54475928342.pdfIn PDF document text
    • https://s3.amazonaws.com/fatikonavori/vunavimivivapijoxuma.pdfIn PDF document text
    • https://s3.amazonaws.com/labitajaxatufib/faropuzepededatowoziw.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001b37a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B37A 4032 bytes
SHA-256: 51036caeaaec89de8680405f123e86dc84267b6fe8b2de34ea0e6c667ded1fe3
font_01_sfnt_off0001c1ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C1EC 5896 bytes
SHA-256: 6df7a34edd02d8d9e9a56ecb587fff17acc3c176739f045aaa9a30e08549862d
font_02_sfnt_off0001d626.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D626 12188 bytes
SHA-256: b5b1841ae2cf8298f733b968704a16bee8bf9a266c3964cd3631e301dad0aeed

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