Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e93e2b482a90800…

MALICIOUS

PDF

70.0 KB Created: 2021-09-18 06:12:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b72f70de095c154f9d234d027728e3d4 SHA-1: 712052f7001f6d1044cb368777b6c03cd911bb22 SHA-256: 8e93e2b482a9080046ecca5fc2fcbf13127469e461f86295905bf71824feca2c
134 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains embedded JavaScript and numerous external URIs pointing to disposable domains, suggesting it's used to redirect users to malicious websites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a technique to obscure the true destination by using many distinct, low-reputation hosts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pistant.ru/uplcv?utm_term=remove+system+app+root PDF link annotation
    • http://moyamoya.center/images/hand_uploaded/files/fesivoxoga.pdfIn PDF document text
    • http://diakmelo.hu/ckfinder/userfiles/files/wabukinelujinel.pdfIn PDF document text
    • https://intersensor.ro/v2011/Files/fck_upload/file/kunupoxewizonaka.pdfIn PDF document text
    • https://houstoncoinshow.org/FCKeditor/file/89558073399.pdfIn PDF document text
    • https://zapcdn.space/web/img/podborky/files/98699707784.pdfIn PDF document text
    • http://angelofthewinds.org/ckfinder/userfiles/files/86039205448.pdfIn PDF document text
    • http://www.chp.pl/ckfinder/userfiles/files/37022783194.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614174568a91e---84903537456.pdfIn PDF document text
    • http://atrsara.ir/resource/files/39858526108.pdfIn PDF document text
    • http://eschool365.in/js/admin/uploadfiles/file/18243232044.pdfIn PDF document text
    • https://babetravelling.com/ckfinder/userfiles2/files/14477541134.pdfIn PDF document text
    • http://flemingdecal.com/uploads/assets/file/desusibafubesifimata.pdfIn PDF document text
    • http://087334211.kad.tw/kads/ckfinder/userfiles/files/lenaji.pdfIn PDF document text
    • https://gruntbudowa.pl/files/file/32235165119.pdfIn PDF document text
    • http://take114.kr/FileData/ckfinder/files/20210913_852C93B4392803F7.pdfIn PDF document text
    • https://kheops-so.fr/ckfinder/userfiles/files/nanasil.pdfIn PDF document text
    • http://farmaciafasolis.eu/userfiles/files/weparatowid.pdfIn PDF document text
    • https://jazykovytabor.topenglish.sk/app/webroot/gallery/files/47413303256.pdfIn PDF document text
    • http://massageindex.nl/images/uploads/belazowa.pdfIn PDF document text
    • http://condosworld.com/abisol1/userfiles/files/nuzanamunuf.pdfIn PDF document text
    • http://electric-kernbichler.at/sawikixusubetowarez.pdfIn PDF document text
    • http://gavinlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/66154508020.pdfIn PDF document text
    • http://casavacanzesanvito.eu/userfiles/files/34957663125.pdfIn PDF document text
    • 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_off0000b4cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ccde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCDE 14940 bytes
SHA-256: 6425dc14aa7d53cb91ec25ec5767be9eb1168a99fda78ed77c82d9047263efe4
font_02_sfnt_off0000f2bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2BC 10396 bytes
SHA-256: 0c3ced77c3cfbd1c9e22fa4bf0af36d10255ca126ed8e9f0f8dc0044c1599fb2

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