Malicious PDF — malware analysis report

Static analysis result for SHA-256 b23b98c27f41808a…

MALICIOUS

PDF

74.7 KB Created: 2021-03-24 23:01:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: c3e0d68d0201c81a859af3344606d610 SHA-1: 7643308fe1d5b8b76ff858c7fa1e3529ac4d6b4a SHA-256: b23b98c27f41808a23d6974b07812ab9dcd538fa84a5e77d8dcbf0666d6b815d
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://leonvi.ru/wix?keyword=boone+family+funeral+home+nc PDF link annotation
    • https://cdn.sqhk.co/zutijujes/ijfftAB/mr_maker_level_editor_download.pdfIn PDF document text
    • https://temazojirilezin.weebly.com/uploads/1/3/2/3/132302863/jisebofatasijo-tupudapupomap-gezirawug.pdfIn PDF document text
    • http://golosa-spasibo.ru/dunkin_donuts_ingredients_chocolate_frostedsuee2.pdfIn PDF document text
    • https://cdn.sqhk.co/futevanu/hZ2jan5/sirako.pdfIn PDF document text
    • http://help-mediasupport.com/hitchhiker_s_guide_to_the_galaxy_movieg909l.pdfIn PDF document text
    • https://cdn.sqhk.co/lenubire/VjcTI2A/37990740903.pdfIn PDF document text
    • http://quickpapp.online/84283878518v88zv.pdfIn PDF document text
    • https://cdn.sqhk.co/matijamaj/akjeH7R/gobulofagufofovimepijix.pdfIn PDF document text
    • https://cdn.sqhk.co/vubiwete/dgfghfD/44612668304.pdfIn PDF document text
    • http://eurozone.pro/849502342902e6u4.pdfIn PDF document text
    • http://parkingtest.xyz/58964369290bprsi.pdfIn PDF document text
    • http://voyazh-shina.com/how_do_you_find_out_your_hcg_levels83gb6.pdfIn PDF document text
    • https://cdn.sqhk.co/pibilebomek/Thekhel/18563265628.pdfIn PDF document text
    • http://universe1.space/pixel_royale_unblocked5tpkw.pdfIn PDF document text
    • http://organicsss.space/jerilesols5z7y.pdfIn PDF document text
    • https://fadexawotizetav.weebly.com/uploads/1/3/4/3/134339615/252cfd6cb76e.pdfIn PDF document text
    • https://gaxasexafarud.weebly.com/uploads/1/3/4/5/134590452/4213791.pdfIn PDF document text
    • https://faluwesidiji.weebly.com/uploads/1/3/0/7/130738597/pesivebekakidakil.pdfIn PDF document text
    • https://pejudipevunasu.weebly.com/uploads/1/3/5/3/135351173/7967735.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8ee4d174-735f-4cd7-9396-c3a65dbcc337.filesusr.com/ugd/5ac313_617382695273469d87b4da547438cac2.pdf?index=trueIn PDF document text
    • https://80f75f89-a1e3-4611-a0ef-7a704eb82da9.filesusr.com/ugd/0286dd_49323dca68ae4fe39e080ac891416ca4.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_off0000e87c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE87C 5096 bytes
SHA-256: eeff0c8ef0e3fd635a1b4d6279e68203df0489e44816fbba1fefcfb0d2703b98
font_01_sfnt_off0000f9ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9AD 10508 bytes
SHA-256: fcb2cd68c4a2df75fe303c47404a3e88b00344329bdcf2d4fa3e7de5095c76a8

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