Malicious PDF — malware analysis report

Static analysis result for SHA-256 108d44dd5c3098f0…

MALICIOUS

PDF

74.7 KB Created: 2021-09-16 02:09:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: d85513211c2df40a0ddcfb4bffd36997 SHA-1: 12832e92040db4e7a3b9e82ccdb9f05f30f2ee9e SHA-256: 108d44dd5c3098f0236e18ea049e36049ff0af2ea60dfd847eb8f8b495a58eaf
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of numerous embedded URLs pointing to various domains, many of which appear to be link farms or disposable hosting, suggests a phishing or malware distribution campaign. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 5

  • 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.
  • 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://homearcky.nl/userfiles/file/94414619707.pdf In PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/f472a58c57c1d2708947ba4b55e5c968/66268962492.pdfIn PDF document text
    • http://abwclayton.com/uploads/files/sipasudemoniterexebenoru.pdfIn PDF document text
    • http://3asoft.vn/img/files/kidomor.pdfIn PDF document text
    • http://media-production.net/admin/ckfinder/userfiles/files/79255030492.pdfIn PDF document text
    • http://giustizianuova.it/userfiles/file/lidubizumovun.pdfIn PDF document text
    • http://klinok-saintp.ru/files/tobutipevojabapinokil.pdfIn PDF document text
    • http://lovepetclinics.com/file_media/file_image/file/bovuzeguretig.pdfIn PDF document text
    • http://xn--djr00fsyfv0o5qgy9u.com/filespath/files/20210906120922.pdfIn PDF document text
    • http://logiccpacma.com/ckfinder/userfiles/files/359172244.pdfIn PDF document text
    • http://metabolit-plus.ru/files/file/25224154044.pdfIn PDF document text
    • https://omnistopbollards.com/application/third_party/ckfinder/userfiles/files/7097677557.pdfIn PDF document text
    • http://kibbkw.com/uploads/files/nizibidibinixafelevufe.pdfIn PDF document text
    • https://xn--49st2et51duvk.com/upload/files/32936123253.pdfIn PDF document text
    • https://petpetmates.com/files/editor/file/budusulemo.pdfIn PDF document text
    • http://zawodydrwali.pl/app/webroot/userfiles/file/miwekajevire.pdfIn PDF document text
    • http://magooferta.pl/uploads/fck/file/wosozukodunina.pdfIn PDF document text
    • http://gma.ge/admin/ckeditor/ckfinder/userfiles/files/pebabalegonok.pdfIn PDF document text
    • http://sllight.ru/design/img/upload/file/luwatokazibaxakuno.pdfIn PDF document text
    • https://namphuctourist.com/userfiles/file/tezubotep.pdfIn PDF document text
    • https://pensionradvanice.cz/res/file/33927748052.pdfIn PDF document text
    • http://execdentalclinic.com/uploads/ckfinder/userfiles/files/debez.pdfIn PDF document text
    • http://polskienarty.pl/data/aktualnosci_imgs/file/72109863788.pdfIn PDF document text
    • http://njxinbell.com/upload/files/94429893347.pdfIn PDF document text
    • http://charivne.info/images/file/45493866446.pdfIn PDF document text
    • http://acelybio.com/upload/files/12284120124.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=speedify+apk+proPDF 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_off0000c28e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC28E 10356 bytes
SHA-256: 496689fe439fce8f983abe0462fe0e921db8b4cf7b83e47ebcb4436275320bc0
font_01_sfnt_off0000da1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA1B 16700 bytes
SHA-256: f97198e7c2cdf67a34682ddaa50e07683d22703fe6d512f1f003e66c3643d80c
font_02_sfnt_off00010527.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10527 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1