Malicious PDF — malware analysis report

Static analysis result for SHA-256 81a34a4880a807ae…

MALICIOUS

PDF

71.9 KB Created: 2021-09-25 04:57:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1351e7ff6bd285771bd99fb1b4cb02a1 SHA-1: c36061eb8517d13376bf3fd3a2cf3664a0b30a04 SHA-256: 81a34a4880a807aeddc694b9687072153b3fb9442c6b7b9954699e4b774e7402
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of embedded URLs, many pointing to suspicious domains, suggesting an attempt to redirect users to malicious sites. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic further supports this, indicating a link farm designed for SEO manipulation or malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://ahaadesign-com-tw.sales-frontier.com/ckfinder/userfiles/files/fasopupogatedumuv.pdf In PDF document text
    • http://centrlita.ru/archive/image/file/jetudotekazun.pdfIn PDF document text
    • https://mepho.hu/ckfinder/userfiles/files/tamitoxopexajimaxoli.pdfIn PDF document text
    • http://rockhouseschool.com/rockhouse/uploads/files/rawinizojigaxibolimolixu.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/aa2911e9206949df761bc0e63f3d051a/tadatopukagobeve.pdfIn PDF document text
    • https://hk-delight.com/UploadFiles/file/76534862202.pdfIn PDF document text
    • https://allianztc.ro/files/file/jujusulikak.pdfIn PDF document text
    • http://cnfglgreat.netsociality.com/upload/files/natikiretatijexotogezipu.pdfIn PDF document text
    • http://busto-wl.gattinonimondodivacanze.it/themes/userfiles/files/sisuwuzukuba.pdfIn PDF document text
    • http://iiiemjobs.com/FCK_Editor_Images/files/wuwugarazuxiviwez.pdfIn PDF document text
    • http://associazionemillesogni.it/userfiles/files/doxafidikej.pdfIn PDF document text
    • http://rubivina.com/Images_upload/files/38076774018.pdfIn PDF document text
    • http://studiozammuner.eu/userfiles/files/zejumepiwotojikuduvalu.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137f95cc0df5---4094530457.pdfIn PDF document text
    • https://sharjahcements.com/images/bulk_images/files/vamur.pdfIn PDF document text
    • http://np-laser.com/upload_fck/file/2021-9-5/20210905093209239708.pdfIn PDF document text
    • http://women-for-marriage.com/ckfinder/userfiles/files/zajirikojuminamu.pdfIn PDF document text
    • https://mimpisiluman.com/contents/files/99949193714.pdfIn PDF document text
    • https://bandotrading.com/uploads/file/sifur.pdfIn PDF document text
    • http://metaglas.kr/userData/board/file/tewozelunomovokitan.pdfIn PDF document text
    • https://stehovani-ostrava.cz/static_pages_files/file/57856530853.pdfIn PDF document text
    • http://jolanyee.com/upload/files/202109062026055155.pdfIn PDF document text
    • https://xn--z4qq44i.tw/upload/actfiles/6508012944.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=new+launcher+2021+apk+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_off0000b16c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB16C 18232 bytes
SHA-256: f8c58380dffa31286f8e9614cc6219b56e430305c564e5adaba2a896b9412755
font_01_sfnt_off0000df6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF6D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f784.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF784 10800 bytes
SHA-256: a9ac96414a681713840861b7970e821dfa5478727efafc3b53911acb5c1f72d5

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