Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a45b61cb928f5b3…

MALICIOUS

PDF

71.3 KB Created: 2021-09-09 21:02:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8f36ba032b10ffa5a9801f086ec81232 SHA-1: 0bfd27f8412f1ac7813552e49ee3376e7328db32 SHA-256: 4a45b61cb928f5b35513e1142558c16923b0fa6744369e9e2ae5d3ba7e8b49ed
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains a link farm with numerous disposable URLs, suggesting a phishing or malware distribution attempt. The presence of external URIs and a link farm heuristic points towards an attack pattern focused on redirecting users to potentially harmful content or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • 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 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://volareinmongolfiera.it/userfiles/files/81719266636.pdf In PDF document text
    • http://underbutter.cz/download/foto/64063138314.pdfIn PDF document text
    • https://aimtronu.org/userfiles/file/jelimagofiliderorovis.pdfIn PDF document text
    • http://zxsolar.com/d/files/23007372493.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/o2pc1bnahkdt99dp2vj332dr92/jobutozisoduwenomipi.pdfIn PDF document text
    • http://dungcubepgiangtrinh.com/webroot/img/files/kokozedewux.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612f9d203aacf---poxak.pdfIn PDF document text
    • http://onestep-tokyo.com/userfiles/file/78062616085.pdfIn PDF document text
    • https://lanjutpt1.com/contents/files/95326050593.pdfIn PDF document text
    • https://a-metal.e-giant.net/archive/file/files/50466695089.pdfIn PDF document text
    • http://erbamedica.org/userfiles/files/gikotokazejevo.pdfIn PDF document text
    • http://orthodoxvaidikasanghom.org/userfiles/file/wovoweruletizumiporu.pdfIn PDF document text
    • https://barrier.exma.cl/ckfinder/userfiles/files/xomifameru.pdfIn PDF document text
    • http://mlead.net/images/e/file/72624470303.pdfIn PDF document text
    • http://restokrat.info/userfiles/file/duketutodonegipawikofus.pdfIn PDF document text
    • http://xn--80aafbkbafwdti1ahihccrg.xn--p1ai/pict/file/kuxebinuradojifa.pdfIn PDF document text
    • http://sudeoksa.net/userfiles/file/20210902180531.pdfIn PDF document text
    • http://liqaa-lb.com/files/userfiles/files/dizojuxe.pdfIn PDF document text
    • http://safarekhoob.ir/basefile/safarekhoobir/files/97478422357.pdfIn PDF document text
    • http://theseadiaries.com/ckfinder/userfiles/files/52943139107.pdfIn PDF document text
    • http://pickup-ws.com/userfiles/files/firuzipafikutejijuw.pdfIn PDF document text
    • http://gz-chengeng.com/uploadfile/files/lixuwava.pdfIn PDF document text
    • http://taiwanglassgroup.cn/userfiles/file/nodidebiwivotilud.pdfIn PDF document text
    • https://sakkestadbil.no/userfiles/file/49512491435.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=cartoon+network+app+download+apkPDF 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_off0000b62d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB62D 16472 bytes
SHA-256: 772953bd94e455c548667723ac8a3f54455d7ca36f097875ee00588ca9f5401c
font_01_sfnt_off0000e036.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE036 10336 bytes
SHA-256: 26b0f4376a5b01f5415ff42e811adcb21768132a7abd0f99f9746584052042d1
font_02_sfnt_off0000f7bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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