Malicious PDF — malware analysis report

Static analysis result for SHA-256 84d5e7f0da38c0a4…

MALICIOUS

PDF

81.4 KB Created: 2021-09-13 13:49:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 142a5280cb386a4814a0c3ef4e3db09b SHA-1: 8f9fb43f7ea7508f36b5762ebeb0a8afe92edf28 SHA-256: 84d5e7f0da38c0a4f11223975df67af4bf816c253b664721f99774e8b4f53d33
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF file flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The presence of external URIs and the ML classification strongly suggest this PDF is used to redirect users to malicious sites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://haysalon.com/public_html/userfiles/file/kowudofiwixawikenov.pdf In PDF document text
    • https://santa.sg/images/users/00000000/files/66878190332.pdfIn PDF document text
    • http://munnartourism.com/uploads/file/novadimikamumezisavi.pdfIn PDF document text
    • http://xinshifm.com/userfiles/file/90636967974.pdfIn PDF document text
    • https://drproperty.in/userfiles/file/93220537151.pdfIn PDF document text
    • http://scoutpate.com/userfiles/file/82735381874.pdfIn PDF document text
    • https://atvatextile.com/upload/ckfinder/files/firuro.pdfIn PDF document text
    • https://myagenda.myagenda.cz/pictures/editor/files/gimilivitivenanobo.pdfIn PDF document text
    • http://phutungototuanphat.com/img-tvdl/files/nomelusalimurugajatibozo.pdfIn PDF document text
    • http://donahoelawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fojivoberilujuw.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16138c2dd95bd1---28639253068.pdfIn PDF document text
    • http://kowalstwwo.pl/public/cms/images/file/88473767883.pdfIn PDF document text
    • http://ulsantour.com/FileData/ckfinder/files/20210903_CE4E35F36EDF59BB.pdfIn PDF document text
    • http://klm-co.ru/foto/ck/files/95538695603.pdfIn PDF document text
    • http://voszveszprem.hu/_user/file/xivutizozipepavila.pdfIn PDF document text
    • http://dh-cell.com/ckfinder/userfiles/files/lonazasolapi.pdfIn PDF document text
    • http://kiiga.ru/userfiles/file/xasibuzeranoxi.pdfIn PDF document text
    • http://vincitydata.com/uploads/ckfinder/files/79208539299.pdfIn PDF document text
    • http://talani.nl/userfiles/image/file/dubab.pdfIn PDF document text
    • https://mcq-exambd.bdbabymart.com/app/webroot/ckfinder/userfiles/files/jivutukovomuro.pdfIn PDF document text
    • http://cameradungphat.com/uploads/files/vezeretatu.pdfIn PDF document text
    • https://honkakuji.jp/honkakuji/images/ckfinder/files/86407170829.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=windows+10+launcher+for+android+free+downloadPDF 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_off0000d860.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD860 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f077.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF077 10828 bytes
SHA-256: e13c33614f7405e57b1d3bfb584c6bb532edbcb96d4e9baeb8d477c275ee9735
font_02_sfnt_off00010972.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10972 17792 bytes
SHA-256: 4f021de0f7505f368e36c09038c0b450c3585ce9a74f4fc4216e82e4fc51b6d1