Malicious PDF — malware analysis report

Static analysis result for SHA-256 57410acd2359d88e…

MALICIOUS

PDF

73.4 KB Created: 2021-10-09 04:53:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 632c041be02a7d005d5b862e8fda2819 SHA-1: 385178c69e89be145a0148ccc619ad1a0e0995bd SHA-256: 57410acd2359d88ee625e8a5aa08926bd72bb9e72ce4f68e78daed78a44f2f80
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV and an ML classifier as malicious. It contains numerous embedded URLs, with one heuristic identifying it as a link farm on disposable hosting. While no scripts were extracted, the presence of many links suggests an attempt to redirect users to malicious sites, likely for phishing or malware delivery. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a tactic to obscure the true destination or spread malicious links across many domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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 http://1day2night.com/UserFiles/file/lotarikaritoxesu.pdf In PDF document text
    • http://hifitness.hu/userfiles/file/fijalodutefiduwusora.pdfIn PDF document text
    • http://emachn.com/data/attachment/file/44263850643.pdfIn PDF document text
    • http://beta-rc.com/upload/files/28795534490.pdfIn PDF document text
    • http://hum-lucknow.org/test/fckeditor/file/doliderijowavezur.pdfIn PDF document text
    • http://feynburg-uhren.de/uploads/81113014155.pdfIn PDF document text
    • https://www.antoniopopolizio.it/ckfinder/userfiles/files/19546253113.pdfIn PDF document text
    • http://brilspa.ro/userfiles/file///medokolumi.pdfIn PDF document text
    • https://vetregistr.com/ckfinder/userfiles/files/75476309517.pdfIn PDF document text
    • http://laxycoffee.com/upload/files/dezajopebirajid.pdfIn PDF document text
    • http://diennuocdanang.com/uploads/image/files/75586034903.pdfIn PDF document text
    • http://urbanelect.com/userfiles/file/fodok.pdfIn PDF document text
    • https://alshuka.ps/ckfinder/userfiles/files/roxilewelogiwufokuwu.pdfIn PDF document text
    • http://www.malagatour.es/ckfinder/userfiles/files/84945968837.pdfIn PDF document text
    • http://lmtechsolution.com/userfiles/sewonizagofogali.pdfIn PDF document text
    • http://annabarons.lv/files/files/suxojanubetaja.pdfIn PDF document text
    • http://upoart.com/ckfinder/userfiles/files/nifadupoxobupux.pdfIn PDF document text
    • http://www.astmalek.cz/obrazky/file/86244614441.pdfIn PDF document text
    • https://ddc-touggourt.dz/ar/files/13242972682.pdfIn PDF document text
    • https://quatden.vn/webroot/img/files/zifudeme.pdfIn PDF document text
    • https://sitarasign.ir/data/file/22970909787.pdfIn PDF document text
    • http://patroha.hu/file/39360392881.pdfIn PDF document text
    • http://ccshecea.org/upload/files/32756853433.pdfIn PDF document text
    • http://packagingandfoodmachinary.com/userfiles/file/12119587133.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/wufogatabasilikute.pdfIn PDF document text
    • http://kidneytracker.com/ckfinder/userfiles/files/2695732701.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=springfield+model+1855+for+salePDF 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_off0000bccb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCCB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d4e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4E2 11212 bytes
SHA-256: 985a1fc3d96a22febaddd67e69cb2c5559bb9887083e1e954f4c032e6bf8420b
font_02_sfnt_off0000eee8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE8 15984 bytes
SHA-256: 25076e718b4499b1c5c197ad32ddc0ba27bb7f6365f9760bf8abe2f1d4b2d79f

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