Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c88327fe8b51ca2…

MALICIOUS

PDF

72.3 KB Created: 2021-09-10 06:54:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-25
MD5: 215a1093a637d5eabf7f43f5921842e3 SHA-1: 22850ac1610554a6561f994d3d81bfc70ed07374 SHA-256: 5c88327fe8b51ca223c7452bcdcd40b107a14d5bddbe8e2f215272cf937d37c1
126 Risk Score

Malware Insights

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

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 0.9973

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 https://il-gusto.com/images/file/dunapezoxebidaxorax.pdf In PDF document text
    • http://sun-apartments.pl/data/pages/97463503831.pdfIn PDF document text
    • http://chinalanpa.com/images/upload/File/duwunebibarax.pdfIn PDF document text
    • https://by-express.com/upfiles/editor/files/sijiwazir.pdfIn PDF document text
    • http://clinicaveterinariagoitese.it/userfiles/files/basifizijubilirotineso.pdfIn PDF document text
    • https://hydratrend.com/application/third_party/ckfinder/userfiles/files/lelikaxaro.pdfIn PDF document text
    • http://gsmontaggi.it/userfiles/files/22140480728.pdfIn PDF document text
    • http://tupnate.com/ckfinder/userfiles/files/worabaxevumosa.pdfIn PDF document text
    • http://net-work.cz/data/file/sotodawexogu.pdfIn PDF document text
    • https://oglethorpeclub.org/~oglethor/UserFiles/file/vegejoferolazoli.pdfIn PDF document text
    • http://yarpb.ru/pic/userfile/kapijebijetit.pdfIn PDF document text
    • http://effektfilm.de/files/file/kikapidabafo.pdfIn PDF document text
    • http://clinical-pain.com/pds/userfiles/files/7234216389.pdfIn PDF document text
    • https://karpataljaturizmus.hu/upload/72398758047.pdfIn PDF document text
    • https://binarbaidfabrication.com/public_html/userfiles/file/20197573776.pdfIn PDF document text
    • http://thewhitmerlawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/13765002290.pdfIn PDF document text
    • http://moiarchitekci.pl/pliki/file/lavotudusuluvi.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021091004030973499.pdfIn PDF document text
    • http://satunatc.ac.th/ckfinder/userfiles/files/71989853739.pdfIn PDF document text
    • https://10kshot.com/customerinterview/ckfinder/userfiles/files/kurufatixulo.pdfIn PDF document text
    • http://polipack.ru/content/file/94788005640.pdfIn PDF document text
    • https://georeno.ca/userfiles/files/tezopijapatijibemobiwubu.pdfIn PDF document text
    • http://oresteruggiero.com/userfiles/files/35091249281.pdfIn PDF document text
    • http://urduhadith.org/survey/userfiles/files/92424186555.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+restore+android+to+factory+settingsPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ba54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA54 10796 bytes
SHA-256: b1bfd865ac584d30503dc6f030c3d5d8bc23127d6fc64b21f0b8b08500887872
font_01_sfnt_off0000d339.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD339 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eb4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB4B 15692 bytes
SHA-256: b4847b84548808437e413fe04f99f41803b1584d44eb33542e68c3d639b085da

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