Malicious PDF — malware analysis report

Static analysis result for SHA-256 acecd308f406755e…

MALICIOUS

PDF

73.8 KB Created: 2021-09-14 06:05:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 551d98d0776df4f99ea3ad47d9b7ba89 SHA-1: 5900ef3538965124acbe0397c0770a83bdb1a140 SHA-256: acecd308f406755efd8316522ae98c81c129e713cf59e7033d069b437f4e4f28
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm designed to redirect users to potentially malicious content. The presence of these links suggests an attempt to lure users to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/b9ab3990417633902ff676b6584cd4d2/mufupofizagisodefit.pdf In PDF document text
    • http://hud101.vn/webroot/img/posts/files/31870261095.pdfIn PDF document text
    • http://mijinmotor.com/fckeditor/userfiles/file/90901958294.pdfIn PDF document text
    • http://metamorfoza-krosno.pl/userfiles/file/43044652562.pdfIn PDF document text
    • http://xn----dtbsgbucafmmaf.xn--p1ai/servimages/editor/files/75565670831.pdfIn PDF document text
    • https://stonebuild.bg/f/uploads/files/38198033854.pdfIn PDF document text
    • http://tecs4.com/intranet/ckfinder/userfiles/files/3122305550.pdfIn PDF document text
    • http://kbcsisa.com/upload/fckeditor/file/17140536695.pdfIn PDF document text
    • http://www.mamafoundation.cz/ckfinder/userfiles/files/74397651560.pdfIn PDF document text
    • https://angkaganjil.com/contents/files/fenutabusadoxi.pdfIn PDF document text
    • http://kondicionery-shodnya.ru/upload_picture/file/74619496472.pdfIn PDF document text
    • http://dymenahealthcare.com/upload/fckeditor/file/sirubadoremojorozi.pdfIn PDF document text
    • http://geologicatoscana.eu/userfiles/files/suzakamapurejijubojekago.pdfIn PDF document text
    • http://rybarict.cz/webpagebuilder/ckfinder/userfiles/files/52412253409.pdfIn PDF document text
    • http://bangiyaparishadtoronto.ca/bpt/editor/uploadfiles/talukorezisopiponi.pdfIn PDF document text
    • http://pivotal-technologies.com/userfiles/file/murivupexarukusosa.pdfIn PDF document text
    • https://dalycity.com/wysiwygfiles/file/satapexaxapifuwokuraxa.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16138b8f7a7ff7---didajosegoxuzijobubovezuv.pdfIn PDF document text
    • http://fairway.cc/images/blog/file/52624176205.pdfIn PDF document text
    • http://hanasushipickup.com/uploads/files/pazubimofonut.pdfIn PDF document text
    • https://laurallo.com/ckfinder/userfiles/files/mibazowozufusug.pdfIn PDF document text
    • https://hospvetcentral.pt/site/upload/file/xexodobozalosixopuv.pdfIn PDF document text
    • http://ksklinika.ru/ckfinder/userfiles/files/58251951508.pdfIn PDF document text
    • https://globalcircle.club/userfiles/file/25132498205.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=minecraft+apk+latest+version+download+freePDF 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_off0000becd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBECD 16300 bytes
SHA-256: 1c916f643d99dd28b85185620b1ad93c03c11e48e484996c67a482669120c3a0
font_01_sfnt_off0000e858.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE858 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001006f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1006F 10848 bytes
SHA-256: 2da9ed6080be7b2b241989f8ec31b59ea5ed932c0b80b5adcb8fda7772e319bc