Malicious PDF — malware analysis report

Static analysis result for SHA-256 88ddf382b33d1df3…

MALICIOUS

PDF

88.2 KB Created: 2021-09-17 15:51:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 272b8e12cdd1c8ec16239055ffd01545 SHA-1: 50e8ccaa5644f437bceb6a0b0aa9f50906b0d0bd SHA-256: 88ddf382b33d1df3547553eee42a77ae99f31d63f6d7cc1185f687b7fa35fc40
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, many of which are part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or redirecting users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://de.ruben.pl/ckfinder/userfiles/files/lodiwifig.pdf In PDF document text
    • http://haithuanphat.com/uploads/files/67104442782.pdfIn PDF document text
    • http://gloteckr.com/upload/editor/file/39653482439.pdfIn PDF document text
    • http://midospa.com/upload/files/zedafaregorekopatemuzezan.pdfIn PDF document text
    • http://nanchang.chinatupai.com/web/js/ckfinder/userfiles/files/69566117496.pdfIn PDF document text
    • https://suadienlanhhanoi.net/upload/files/61374143640.pdfIn PDF document text
    • https://polytex.de/sites/default/files/83951425766.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/4ij84vpts9vbnnvurg38osslqq/wafukifidexegirem.pdfIn PDF document text
    • https://sitpchemcieszyn.pl/_sitpchem/file/fexixarukenede.pdfIn PDF document text
    • http://kerekesvillszer.hu/UserFiles/file/sumuponibetanuxasikarunim.pdfIn PDF document text
    • http://yugang360.com/upload_fck/file/2021-9-9/20210909030502544841.pdfIn PDF document text
    • https://trvstore.com/userfiles/file/xogikaja.pdfIn PDF document text
    • http://starcity-vinhomes.vn/app/webroot/img/files/48084729257.pdfIn PDF document text
    • http://gradn.ru/uploades/fckeditorfile/tiwejisirezuvib.pdfIn PDF document text
    • http://druckmaschinenservice.com/uploads/fce/files/33043210597.pdfIn PDF document text
    • http://opgzvh.hr/upload/file/rodarokitogef.pdfIn PDF document text
    • http://devitohomesorlando.com/userfiles/files/zipobejogegexanerowez.pdfIn PDF document text
    • https://austarpharma.com/upload/files/satug.pdfIn PDF document text
    • http://gartenmessebau.de/uploads/files/barepawewufusux.pdfIn PDF document text
    • https://viktorina.ledoritulys.lt/files/97477360346.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/161444b0dc6caf---jivotepodefilitowira.pdfIn PDF document text
    • https://apaman.ti-am.jp/js/ckfinder/userfiles/files/kuganawuwezuforosamuj.pdfIn PDF document text
    • http://gpshardorawal.com/hemkunt/userfiles/file/89961285640.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=the+wavelength+of+light+in+the+visible+range+isPDF 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_off0000ee19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE19 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010630.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10630 10748 bytes
SHA-256: 8254f06d3d933d159e30dc325c085753644f248ee7d1a8023e4f105a27a61020
font_02_sfnt_off00011ee5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EE5 19760 bytes
SHA-256: a6db34f1a4d4934b633faa1025a3bb0600f99724f1f5ca909ed82641d5f0ad18

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