Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b1106ed42436084…

MALICIOUS

PDF

85.6 KB Created: 2021-09-13 11:00:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-25
MD5: 66dcef65870b6e68c25612966b9fbb4d SHA-1: 510f4ae75511a0fa39c4ebafded02bec54708754 SHA-256: 5b1106ed42436084a7138c26d4d1b6dc80fcaa24c92b7fccd0a262a0c3b2ae0e
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 0.9976

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://wwsm-hk.com/files/file/73177359994.pdf In PDF document text
    • https://frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/zagafukarurizerovufas.pdfIn PDF document text
    • https://tjp2-hotlink-j3t.com/contents/files/48638525076.pdfIn PDF document text
    • http://bajajsports.com/userfiles/file/19813268100.pdfIn PDF document text
    • http://ipllaser.in/uploads/junofifuwufaxoverop.pdfIn PDF document text
    • https://chulintemple.org/CKEdit/upload/files/29878533687.pdfIn PDF document text
    • https://vmwarts.com/ecovic/file/9469794061.pdfIn PDF document text
    • https://tdemo.order-pro.com/ckfinder/userfiles/files/wegonakavad.pdfIn PDF document text
    • https://mygoaltv.org/ipp/images/uploads/files/xotiwunosezinaru.pdfIn PDF document text
    • https://mantyobras.com/userfiles/file/sodibiniwixadozul.pdfIn PDF document text
    • http://evopizza.lt/ckfinder/userfiles/files/lojikinedafotemibigefok.pdfIn PDF document text
    • https://megalightgroup.lv/uploads/files/98371532337.pdfIn PDF document text
    • https://amatnieks.lv/pictures/image/10575918425.pdfIn PDF document text
    • http://mamaskitchenorder.com/uploads/files/rukowubudiwaxojolukife.pdfIn PDF document text
    • https://incense888.com/uploads/files/202109101950258677.pdfIn PDF document text
    • http://michalpavlicek.com/uploaded/file/xenoniwukivaruki.pdfIn PDF document text
    • http://herfon-machinery.com/images/ckfinder/files/20210911131321.pdfIn PDF document text
    • http://thainightjob.com/ckfinder/userfiles/files/35249172697.pdfIn PDF document text
    • http://branonperformance.com/ckfinder/userfiles/files/velelapuzemosex.pdfIn PDF document text
    • http://bulgankhangai.mn/userfiles/files/20219693981.pdfIn PDF document text
    • http://zpb-maciejewski.pl/upload/fck/file/jabif.pdfIn PDF document text
    • https://przyklejki.pl/userfiles/35577965933.pdfIn PDF document text
    • http://amunt.madteam.net/ckfinder/userfiles/files/kevuxatizep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=king+of+fighters+2015+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_off0000e730.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE730 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF42 18060 bytes
SHA-256: 10545625af5b269d6d507082f595e9276e28183fe14e5686a792ff223127047c
font_02_sfnt_off00012eaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EAA 11104 bytes
SHA-256: af48c6edb63a8d70fa5c69aa49ebeab2fc307818dbf213681a5d37f099191e4b

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