Malicious PDF — malware analysis report

Static analysis result for SHA-256 2774456f8b801483…

MALICIOUS

PDF

73.5 KB Created: 2021-09-17 15:22:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 099963c97bf07a61293dd13a874f11c7 SHA-1: adeeaa8da2337ba073e0b439487e6657bbed2f1a SHA-256: 2774456f8b801483970d857e2c970d1f3d713ecf0bbb9d2437045b38a146a257
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to unknown domains, suggesting a link farm or phishing lure. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a strategy to distribute links across many low-reputation domains. While no scripts were explicitly extracted, the nature of the heuristics and the presence of many URLs suggest the PDF is designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://thegoshow.net/userfiles/file/ferirugatupa.pdf
    • http://sasolution.kr/userfiles/file/6983143423.pdf
    • http://investin-khj.ir/ckfinder/userfiles/files/14718729429.pdf
    • https://betamachinery.sa/other_files/File/zuzugutimozajo.pdf
    • https://defi128.phpascal.com/userfiles/files/kikajurukudulomaxojadorad.pdf
    • http://duz-drustvo.si/uporabnik/file/37552436674.pdf
    • http://steinemann-ag.ru/16522316599.pdf
    • http://www.dfdtrading.sk/ckfinder/userfiles/files/fezudu.pdf
    • http://arcos-eff.it/userfiles/files/tizojanenafufosigezas.pdf
    • http://kingsfci.com/userfiles/file/nabuzazigipega.pdf
    • https://imihwa.com/uploads/image/20210904/files/20210904010044.pdf
    • https://dhrc.in/userfiles/file/1552578743.pdf
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139fbf634381---lepip.pdf
    • https://dancleland.com/img/upload/file/99129275940.pdf
    • https://nevjegyzek.eu/uploads/file/19585812356.pdf
    • http://cpgny.com/userfiles/files/70278424427.pdf
    • https://oncallanatomist.com/ckfinder/userfiles/files/xiteluvumatopemufesifoka.pdf
    • http://yizhu580.com/ckfinder/userfiles/files/gumisija.pdf
    • https://majubesar.info/contents/files/13665487495.pdf
    • http://kovospm.cz/fotky/file/naxovikut.pdf
    • https://mccartha-cobb.com/userfiles/files/48358139301.pdf
    • https://amthanhanhsangchinhhang.vn/upload/files/4758416993.pdf
    • https://stopserv.ru/files/file/sameribaboligabelurefad.pdf
    • https://basisangka.com/contents/files/63697544286.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=gta+sa+adreno+lite
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bca0.bin
3f05c13454d3dbb3e5a28d56b55dcc0adbb5b9347ab9653d52e81d4fc0692ed5
pdf-font-stream PDF embedded font (sfnt) at offset 0xBCA0 10280 bytes
font_01_sfnt_off0000d3d9.bin
4a73dd9019a1999dba5957a3828d4f9e5b1703059bc00d1aa69f4f2254579819
pdf-font-stream PDF embedded font (sfnt) at offset 0xD3D9 17144 bytes
font_02_sfnt_off00010059.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10059 16792 bytes