Malicious PDF — malware analysis report

Static analysis result for SHA-256 931e98d9d9c04ed5…

MALICIOUS

PDF

83.2 KB Created: 2021-09-21 19:59:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 045199d87dff8ab793145fb359449334 SHA-1: 4f99020f00776e07ac0b73a1e0927d5ea081f593 SHA-256: 931e98d9d9c04ed5da0f5a8b2a289f81884d23a153450b4aa530098e59c1687d
174 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. The presence of embedded JavaScript and numerous external URLs suggests an attempt to redirect the user to malicious content or download further payloads. The 'Password-protected archive lure' heuristic further supports the idea that this PDF is designed to trick the user into performing an action that leads to malware execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://laborke.ru/uplcv?utm_term=download+aplikasi+efek+gitar+android PDF link annotation
    • http://pujcovnanaradi-tvarozna.cz/userfiles/files/90284581522.pdfIn PDF document text
    • https://chambres-a-la-ferme-plouzelambre.fr/userfiles/file/41514135396.pdfIn PDF document text
    • http://xn--m1age8bh.xn--p1ai/files/file/buvubalagopoduxulamilik.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20210913224751_560473275.pdfIn PDF document text
    • https://bushregenerators.net/userfiles/files/gelelafovegazujalaf.pdfIn PDF document text
    • http://w-f-l.de/user_img/file/dofudamosepimawakofub.pdfIn PDF document text
    • http://www.idukkidiocese.org/files/js/ckfinder/userfiles/files/58432459926.pdfIn PDF document text
    • https://zd-zeta.com/uploads/files/202109061354305096.pdfIn PDF document text
    • https://receptabc.hu/images_banner/files/sugivasiliderotijoje.pdfIn PDF document text
    • http://hzdsbg.cn/uploadfile/1630783671.pdfIn PDF document text
    • http://thienthaopc.com/upload/FCK/file/74827719338.pdfIn PDF document text
    • https://tskrea.com/userfiles/file/tixigesebamu.pdfIn PDF document text
    • http://homeloanz.net/images/e/file/46152009874.pdfIn PDF document text
    • http://psychanalyste-gard.fr/ckfinder/userfiles/files/13449728731.pdfIn PDF document text
    • http://miydz.com/mingyi/images/userfiles/file/66589165409.pdfIn PDF document text
    • https://soyana.de/js/ckfinder/userfiles/files/rijedokafulenubetadi.pdfIn PDF document text
    • https://www.servicespace.org/inc/ckfinder/userfiles/files/95960862923.pdfIn PDF document text
    • https://watfordfairtrade.org/app/webroot/img/files/38528645707.pdfIn PDF document text
    • https://signatureshreyas.in/userfiles/file/kerokera.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/d5uepgabig9chfpequr84pm7h1/79868227360.pdfIn PDF document text
    • https://sanagustin.cl/files/ferafazufefiliwepofepak.pdfIn PDF document text
    • http://www.beverburcht.nl/upload/files/pipiwasopaxaxirevuwogeso.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135b1fcdfa30---jafuvexebawobuxanuwax.pdfIn PDF document text
    • http://webinaris.eu/ckfinder/userfiles/publics/files/najifuxogemigiporerak.pdfIn PDF document text
    • http://www.icf-plant.com/files/file/begezumivazej.pdfIn PDF document text
    • http://chinasoftcore.com/userfiles/file///nubevaroxupitig.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_off0000e226.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE226 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA38 16728 bytes
SHA-256: 5f5193963cea3a6ece87054b1e73d7c1d31df15e85c4ec01864ee63ee99d5210
font_02_sfnt_off000125eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125EB 10852 bytes
SHA-256: 5e939f047fa827869f10abd52f62b229cd4c063cdb46db2428cd9f63ef5562cd