Malicious PDF — malware analysis report

Static analysis result for SHA-256 d51f07e6b5d4a312…

MALICIOUS

PDF

67.9 KB Created: 2021-09-10 18:56:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8a99b4be52b7a57d91b87dfbe263dc63 SHA-1: bfb9cf96d3b2c13029f189261439b84e8f2ec5c3 SHA-256: d51f07e6b5d4a312b763b49b0c588ea05bb7bedfdf3b6036a5737927411daa67
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML and ClamAV as malicious, with heuristics indicating it functions as a link farm on disposable hosting. The embedded URLs, such as 'https://goldenlinejsc.com/userfiles/file/selajipejepibi.pdf', are likely intended to redirect users to phishing or malware distribution sites. The document body was unreadable, but the overall structure and heuristic firings strongly suggest a malicious intent to lure victims.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 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://goldenlinejsc.com/userfiles/file/selajipejepibi.pdf In PDF document text
    • http://korea-seals.com/ckfinder/userfiles/files/47400175541.pdfIn PDF document text
    • http://solarissoft.com/img/userfiles/files/gokin.pdfIn PDF document text
    • https://jogamiskolc.hu/ckfinder/userfiles/files/deborejega.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/32592961800.pdfIn PDF document text
    • https://aquatrustfina.com/userfiles/file/97939346018.pdfIn PDF document text
    • https://villanakarin.com/userfiles/files/muwabuloguzujodi.pdfIn PDF document text
    • http://lpxs168.com/filespath/files/20210903155657.pdfIn PDF document text
    • http://gelateriacool.it/userfiles/files/70824845398.pdfIn PDF document text
    • http://westhollywood.ilovepokebar.com/uploads/files/varapew.pdfIn PDF document text
    • https://umutfm.com/resimler/files/35930775248.pdfIn PDF document text
    • http://revucue.com/ckfinder/userfiles/files/36943608374.pdfIn PDF document text
    • http://healthywithhart.com/res/file/88975297067.pdfIn PDF document text
    • http://aftp.bg/userfiles/file/tumifulaluvizijijunufijob.pdfIn PDF document text
    • http://a9188.com/upload_files/art_files/files/20210906_162920.pdfIn PDF document text
    • http://acelybio.com/upload/files/16366000643.pdfIn PDF document text
    • https://calprin.com/ckfinder/userfiles/files/18335101039.pdfIn PDF document text
    • http://szerecsengyogyszertar.hu/editor_up/fevakogipejituxuwafil.pdfIn PDF document text
    • http://screen.by/images/file/xejor.pdfIn PDF document text
    • http://cnwt.mgo.cool/upfile/files/2021/09/02/juleguwunena.pdfIn PDF document text
    • http://memsports.com.br/admin/libs/ckeditor/ckfinder/files/tipuzikisod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=my+talking+tom+play+storePDF link annotation
    • 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://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_off0000ac2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC2A 15036 bytes
SHA-256: ca81ef2d2c1c75f869fdf7bb8487b1ae03496984c5053bf2a5dc4ed2b6957fbf
font_01_sfnt_off0000d1ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1ED 10792 bytes
SHA-256: 093f981acc0a24cecae7f50aa9a0079bc5875e9fefdac202f6bb14e6f1ceb407
font_02_sfnt_off0000eac8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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