Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c4e4d0edc44c3ee…

MALICIOUS

PDF

84.7 KB Created: 2021-09-10 06:02:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 30493c3a42b8a35d851bddcb34b40e6c SHA-1: 0691a892078c52f71b6b8c776bd8fe59ec7caef3 SHA-256: 9c4e4d0edc44c3ee5b5d5eb0db0209b448b373c11d99244db2bacd6c4e421363
126 Risk Score

Malware Insights

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

The PDF contains numerous links to external PDFs hosted on disposable domains, indicating a link farm designed to obscure the ultimate destination. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing trojan. While no scripts were directly extracted, the structure and heuristic firings suggest an attempt to exploit PDF vulnerabilities or redirect users to malicious content.

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://coiffurenais.com/userfiles/file/xivojoxaratazij.pdf In PDF document text
    • https://dianthusindustrial.com/resimler/files/giniwino.pdfIn PDF document text
    • http://laserinnsbruck.com/static/26972256833.pdfIn PDF document text
    • http://dglytbt.com/upfolder/e/files/20210910030704.pdfIn PDF document text
    • https://egca.fr/userfiles/file/lojewimexinewitepijeled.pdfIn PDF document text
    • https://interstudy.net/userfiles/file/48842627817.pdfIn PDF document text
    • https://maritime-models.com/userfiles/file/nifekatejarokojod.pdfIn PDF document text
    • http://braciszewska-klimek.pl/fck_files/file/potoz.pdfIn PDF document text
    • https://selapro.com.au/application/third_party/ckfinder/userfiles/files/16401313746.pdfIn PDF document text
    • http://webursitet.org/Files/file/xelafimusele.pdfIn PDF document text
    • https://bisleriwheel.genefied.co/ckfinder/userfiles/files/94158786270.pdfIn PDF document text
    • http://dr-onesrl.com/userfiles/files/71373123103.pdfIn PDF document text
    • http://maternites-catholiques.org/ressource/site-image/files/60601641547.pdfIn PDF document text
    • http://pusheng168.com/uploadfiles/20210909110955.pdfIn PDF document text
    • http://salkim.com/userfiles/file/29548550151.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/91213669021.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/16137b63e68c63---bulozipupanupunomugadez.pdfIn PDF document text
    • http://skkouty.cz/ckfinder/userfiles/files/tavadixabozenogadetugi.pdfIn PDF document text
    • https://pasationtravellers.com/root/FCKeditor/file/dunawazepajoj.pdfIn PDF document text
    • http://srtprogetti.eu/userfiles/files/73410617233.pdfIn PDF document text
    • http://lamgi.pl/ckfinder/userfiles/files/49722844965.pdfIn PDF document text
    • http://sunil.kr/uploadfile/fckeditor/file/matexoz.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/161307b0208491---39879974989.pdfIn PDF document text
    • https://salvamontbihor.ro/app/webroot/files/userfiles/files/netebopidazinerutenobif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+change+typing+sound+on+androidPDF 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_off0000e4de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4DE 18120 bytes
SHA-256: b3ac849e94968365198cdbbc31602a81b1b1f7667658156751a753717e08319d
font_01_sfnt_off00011351.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11351 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012b68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B68 11036 bytes
SHA-256: 2157ada185800d628e8a9a183a9dbc7af576ff70431a11a8a6819af11e081899

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