Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3e58c4c08085e30…

MALICIOUS

PDF

68.6 KB Created: 2021-09-27 04:24:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 652bd1ef4dba54b44971ef5af9835fd5 SHA-1: 1db05af6bd02a097a3fbd40a33177890735cc92f SHA-256: a3e58c4c08085e3095c6bf6ac44d774cfd7e7a910173ee6fb23cca138f3ae551
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. It contains an image-only document with a clickable action, typical of a screenshot lure designed to redirect users to external URLs. The presence of numerous distinct hosts and disposable links further supports its use as a link farm for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://zezoalza.com/ckupload/files/66158826065.pdf In PDF document text
    • https://twr1115.net/files/fckeditor/file/58506431301.pdfIn PDF document text
    • http://gvs-russia.ru/admin/ckfinder/userfiles/files/runabuzuduzanokosonelojom.pdfIn PDF document text
    • https://albizy.com/ckfinder/userfiles/files/geromotaborapuzav.pdfIn PDF document text
    • http://kidneytracker.com/ckfinder/userfiles/files/85514351364.pdfIn PDF document text
    • http://agisma.ru/files/pages/files/vunaropavazawi.pdfIn PDF document text
    • http://zsmnowakowski.pl/userfiles/file/zelorep.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142f3c57e5dd---94534621266.pdfIn PDF document text
    • https://alteanetworks.fr/img/file/vuluvudiki.pdfIn PDF document text
    • http://www.moyekolodin.com/files/limovilovaxukapupu.pdfIn PDF document text
    • http://roomyab.ir/basefile/roomyabir/files/8581084619.pdfIn PDF document text
    • https://girisimhaber.com/uploads/file/71711788500.pdfIn PDF document text
    • https://alajuusa.ee/media/contents/file/46603610843.pdfIn PDF document text
    • https://tecnibat.net/uploads/archivos/lejifuvedixokot.pdfIn PDF document text
    • http://margheritango.it/userfiles/file/55145731858.pdfIn PDF document text
    • http://etabetasurvey.com/userfiles/files/zavipizi.pdfIn PDF document text
    • https://sailstudy.in/ckfinder/userfiles/files/33055289530.pdfIn PDF document text
    • http://vaithun.net/upload/files/tituwunitujulalirunivexe.pdfIn PDF document text
    • http://strandedtattoo.info/file/fetotubibagidit.pdfIn PDF document text
    • http://panda-es.tokyo/yamituki-n/uploads/files/gutulib.pdfIn PDF document text
    • http://tsradviseurs.nl/mailing/images/photo/file/60746758837.pdfIn PDF document text
    • https://rdsdealers.com/ckfinder/userfiles/files/fifutefemo.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/8a3859bd8f94ef657019c065e0f016d8/wusem.pdfIn PDF document text
    • https://ww150004.linebot.net/upfile/files/20210926151149.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=advanced+call+blocker+pro+full+apkPDF 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_off0000b14f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB14F 13920 bytes
SHA-256: d4e3c7f766aa13ca9f84ac1cf136a5584dcf31669b351f0c4b756b5b19f445d7
font_01_sfnt_off0000d3e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ebfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBFC 10632 bytes
SHA-256: a54283ff7715a8a3135979ca07860920858b84b080b6eddb2b24cfd2337d2ae7