Malicious PDF — malware analysis report

Static analysis result for SHA-256 67ce3c75fbfb0b4d…

MALICIOUS

PDF

81.1 KB Created: 2021-03-10 09:29:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: f134cfe809f5225f2188be8cd5346f98 SHA-1: 6fb47ddc4fb709e2cdd5c2e1af8a81073fb76e4f SHA-256: 67ce3c75fbfb0b4d501cb3987d7884fc4735129f8c5b1b2d637fc2cc8db147d9
186 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 disposable hosting, suggesting a link farm or SEO spam operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous embedded URLs are indicative of an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://resalured.ru/123?utm_term=basic+brush+pen+calligraphy+worksheet PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4409257/normal_6041abe32031d.pdfIn PDF document text
    • https://lojexidipiwakif.weebly.com/uploads/1/3/4/0/134041559/6b50180f3bfb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380395/normal_5ff182ac987da.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413978/normal_5fcc9901d232a.pdfIn PDF document text
    • http://xoziduso.mypressonline.com/12058244777.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501980/normal_5ff1442db52c5.pdfIn PDF document text
    • https://lipemegovaw.weebly.com/uploads/1/3/4/7/134766771/1167636.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446507/normal_603d0b9dd9dbd.pdfIn PDF document text
    • http://zutelotojenexop.getenjoyment.net/wupavopow.pdfIn PDF document text
    • http://dokelamalide.iblogger.org/36472134756.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427077/normal_603e7667e8961.pdfIn PDF document text
    • https://lonofajizol.weebly.com/uploads/1/3/5/3/135389348/56f556ecdc8d0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426688/normal_6007564cb4639.pdfIn PDF document text
    • http://ruwemipuwev.mypressonline.com/usmle_first_aid_2019_google_drive.pdfIn PDF document text
    • https://kisofoga.weebly.com/uploads/1/3/1/3/131383553/8742607.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://299bc67c-4c9a-44ea-852c-18f2d39dca40.filesusr.com/ugd/954c8b_f7526aba125b467996b3a60efbbb66c6.pdf?index=trueIn PDF document text
    • http://desuvusemexemob.epizy.com/xuzebolulimovinevos.pdfIn PDF document text
    • https://2cc3dcad-61c1-4442-8662-ca5be7cd8672.filesusr.com/ugd/71b93f_d314eab85ee84622bfbc6f2c8e9d397d.pdf?index=trueIn PDF document text
    • http://nerusejide.rf.gd/facebook_cover_template_psd_2018.pdfIn PDF document text
    • https://bd09a4ac-0dd2-4533-a87c-7e18f90dd81b.filesusr.com/ugd/1b0481_00218166e9f0448b8a300e960cc99e4c.pdf?index=trueIn PDF document text
    • http://pudolajuji.atwebpages.com/corporation_bank_account_closing_form.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B8 5644 bytes
SHA-256: e82e6ba384d4096fdfa08aee093b6c155d03d08f0a532b255bf0415fc99378e6
font_01_sfnt_off0000fbf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBF8 10508 bytes
SHA-256: 1f30efca3fdb60bac103b8017d32437d990485a68705822c3bfaed7825c62b65
font_02_sfnt_off00012033.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12033 16476 bytes
SHA-256: 4bbd9570ceb64f8475eea163f28d575b6648c2999fc8de717f27421da39bd6c1