Malicious PDF — malware analysis report

Static analysis result for SHA-256 f35c042c86697b89…

MALICIOUS

PDF

82.9 KB Created: 2021-09-21 03:51:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 12109db4914840f7ae95392b6b7a72ef SHA-1: 6c1253132b107aa0490e40156bf72609c2ac9ed7 SHA-256: f35c042c86697b893ceefa2a009e27584e4a0c9cf60c8f8087d3891b30d2db94
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm using disposable hosting, with numerous embedded URLs pointing to potentially malicious content. The primary attack pattern involves redirecting users through these links, likely to phishing sites or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c6cc450e12---62532908003.pdf In PDF document text
    • http://presssimayeshahr.ir/pic/file/94284893067.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144ed819e626---palemo.pdfIn PDF document text
    • https://mandarinkinesiska.com/userfiles/file/44446090764.pdfIn PDF document text
    • http://preiss.at/upload_files/files/sanonuzoxitobe.pdfIn PDF document text
    • http://aleshashop.net/uploaded_files/userfiles/files/jizezazanogavotevi.pdfIn PDF document text
    • http://giftboxvietthuy.com/upload/ck/files/25309349577.pdfIn PDF document text
    • https://brawlcall.com/ckfinder/userfiles/files/29822553829.pdfIn PDF document text
    • http://kaitosushisb.com/uploads/files/46666246550.pdfIn PDF document text
    • http://eros-arena.com/eros/userfiles/file/pewovegijamajumobavomiw.pdfIn PDF document text
    • https://shatalarab-llc.net/userfiles/files/50371127537.pdfIn PDF document text
    • http://steffis-strassladen.de/userfiles/file/suzogi.pdfIn PDF document text
    • http://self119.net/upload/userfiles/2021/09/files/210905060102.pdfIn PDF document text
    • http://idealhca.com/admin/images/file/liwutikogekideweko.pdfIn PDF document text
    • http://labellebeaute.com.hk/ckfinder/userfiles/files/mutujifalav.pdfIn PDF document text
    • http://retrolondontees.com/userfiles/file/50189034440.pdfIn PDF document text
    • http://favourtec.com/attachment/file/zawadikedovetaxa.pdfIn PDF document text
    • https://mr-alian.com/upload/ckfinder/files/povobibufej.pdfIn PDF document text
    • https://floraplant.gr/FCKeditor/userimages/file/33854922785.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/lunatopijen.pdfIn PDF document text
    • https://goodmix-psc.com/userfiles/files/66881205941.pdfIn PDF document text
    • http://abwlanham.com/uploads/files/limutagagefuxi.pdfIn PDF document text
    • http://lyzph.com/userfiles/file/Fl202109181547095473.pdfIn PDF document text
    • https://urbanshapes.in/userfiles/file/loduxobuwamajopawo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=wcc2+main+obb+file+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_off0000de69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE69 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f680.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF680 10612 bytes
SHA-256: 87f86363156afe6e0f26bb407f4fb343ae0e83d626d5d3fe88e5b46782563134
font_02_sfnt_off00010ecd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ECD 18080 bytes
SHA-256: 2cf074a9b2ac9eddae1e9adba2921e1f3a48224547c59c58c0b750ff41ac6775

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