Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3664b5b95c30d3a…

MALICIOUS

PDF

69.3 KB Created: 2021-09-27 10:30:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 2d114dfed938e2d8aeb27981dd163aa1 SHA-1: 1e1305c8e4e2996dbfa4c94c5417e38f5b15c2fb SHA-256: b3664b5b95c30d3acaeaf49ef9ed8a3e9d6be7041350f89e8ac8738aa0620fab
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to suspicious domains and are likely part of a link farm designed to host malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing or trojan. The presence of external URIs and the link farm heuristic suggest the document's primary purpose is to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://dsraxys.com/uploads/xozudixan.pdf In PDF document text
    • http://chickenwild.com/upload/contents/images/images/52402344416.pdfIn PDF document text
    • http://yossy.biz/userfiles/file/sejozibikerawuzaw.pdfIn PDF document text
    • http://cuanhomkinhtoanthang.com/media/file/nozudujokisez.pdfIn PDF document text
    • https://verlauf-ekb.ru/admin/ckfinder/userfiles/files/25337257077.pdfIn PDF document text
    • http://xn--b1agjlwjc3g.xn--p1ai/ckfinder/userfiles/files/nijidisad.pdfIn PDF document text
    • https://tranhdaquyhn.com/uploads/news_file/5279707524.pdfIn PDF document text
    • https://12shio4.com/contents/files/wawiter.pdfIn PDF document text
    • http://cungcapbaoduongcuanhatban.com/upload/files/14772794850.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/a140c71836799f9c3023b21212715148/fubejerijiwadi.pdfIn PDF document text
    • http://nuovojob.com/userfiles/files/12944173472.pdfIn PDF document text
    • http://taikenplan.jp/ckfinder/userfiles/files/sisilu.pdfIn PDF document text
    • https://braveathlete.net/geektic/files/gelexomobegobisagesuko.pdfIn PDF document text
    • https://indiachristian.org/uploads/files/rixeruwujezefa.pdfIn PDF document text
    • https://dnsbp.com/all4help/fckuserfiles/file/96069830734.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e39a2569e4---61547334412.pdfIn PDF document text
    • http://www.jasfec.com/imgs/uploads/pegekifuzisinakaw.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/zokesiwobopukozobodoso.pdfIn PDF document text
    • https://www.pollackmihalyiskola.hu/ckfinder/userfiles/files/75149490239.pdfIn PDF document text
    • https://aslplastic.com/ckfinder/userfiles/files/69522926920.pdfIn PDF document text
    • http://kleinschaden-expert.de/userfiles/file/89375711537.pdfIn PDF document text
    • https://fibaquitaine.fr/cebatrama/userfiles/files/sipibopavibinu.pdfIn PDF document text
    • https://ideylia.fr/uploads/file/9062142352.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=namal+novel+pdf+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_off0000b0d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0D4 15420 bytes
SHA-256: a5adb8650b966285cf1ef589aeb77622c5aca571dbd471e932493ff18048d33b
font_01_sfnt_off0000d79c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD79C 10420 bytes
SHA-256: 4bd71dd23a05cc7dbf8a6d01a62001c135bb43935e52b9785dc24fd966775292
font_02_sfnt_off0000ef2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF2B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1