Malicious PDF — malware analysis report

Static analysis result for SHA-256 73a43a5b6ea7716c…

MALICIOUS

PDF

83.1 KB Created: 2021-09-13 18:34:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 03fa1ef28598c8f0ff9a167faf7a90e0 SHA-1: 3ea52cc14649993a15c62a9fb50e734da487034a SHA-256: 73a43a5b6ea7716c777bc24680aac3ecb8caf9eefc7cf773389892fb4adb49d0
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, indicating an attempt to redirect the user to malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of embedded JavaScript points to T1059.007, and the overall nature of the file suggests it was delivered as an attachment, aligning with T1566.001.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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://pakianco.ir/data/image/uploads/news/files/lababijuvuxigaxukita.pdf In PDF document text
    • https://www.domaine-boussard-chablis.fr/ckfinder/userfiles/files/gegokowa.pdfIn PDF document text
    • http://vervesimuhub.com/userfiles/file/53187592447.pdfIn PDF document text
    • http://z-sinpro.com/upload/files/sediga.pdfIn PDF document text
    • http://sakem.org/userfiles/files/vigujonilagigaxuzekoweme.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613da2326d952---lazadawepinofa.pdfIn PDF document text
    • http://www.vnv.nu/admin/library/ckfinder/userfiles/files/67076580205.pdfIn PDF document text
    • https://gospel-streams.com/asset/ckfinder/userfiles/files/deluv.pdfIn PDF document text
    • http://codienlanhtrangia.com/Images_upload/files/87451310539.pdfIn PDF document text
    • http://xn----8sbaqfskngn1qi.xn--p1ai/userfiles/file/94595742366.pdfIn PDF document text
    • http://www.css-jp.com/upfile/files/2021/09/11/45029372340.pdfIn PDF document text
    • https://ecosolar-energy.com/piceditor/file/dasexukobitu.pdfIn PDF document text
    • https://grootformaatspandoeken.nl/userfiles/file/53046646375.pdfIn PDF document text
    • https://used-machinetools.ro/app/webroot/files/userfiles/files/37641692426.pdfIn PDF document text
    • http://ssss-sangam.com/userfiles/file/palikawibilokejagebim.pdfIn PDF document text
    • http://sunil.kr/uploadfile/fckeditor/file/37156304697.pdfIn PDF document text
    • http://aftp.bg/userfiles/file/tumifulaluvizijijunufijob.pdfIn PDF document text
    • https://snpwachq.com/files/js/ckfinder/userfiles/files/zepikuvipemotixisovefiji.pdfIn PDF document text
    • https://traveletrust.com/basefile/traveletrustcom/files/dexubaxugun.pdfIn PDF document text
    • http://cga82.com/admin/File/budugogekifowazasavalox.pdfIn PDF document text
    • https://tonymusic.se/UserFiles/files/39815487973.pdfIn PDF document text
    • http://sushigonewildtogo.com/uploads/files/34589287693.pdfIn PDF document text
    • http://nenayu.com/filespath/files/20210907020712.pdfIn PDF document text
    • http://isystemlab.com/admin/ckfinder/userfiles/files/degijoxutulerabuki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=sonic+cd+cheats+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_off0000e1f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1F6 17392 bytes
SHA-256: 3855ea21835b3857e8d2f9e9e03744a61031d2e3377c1c15ceeaefdf38adba53
font_01_sfnt_off00010f1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F1F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012736.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12736 10496 bytes
SHA-256: 7f412a5ec3cbc7c68b8f823ccef727c8aca60658698eda889c3e45807dff888f