Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd46fac008d82d76…

MALICIOUS

PDF

69.0 KB Created: 2021-09-09 03:07:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 652e36fe1f2b3fcd5c55c85c3e660c8b SHA-1: 39278acfaab28d7db4fa9c11e675180f129d6dac SHA-256: dd46fac008d82d760e143619db2ff75631431e7b4ca7fdbc7caada2dcf7a8fc4
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file exhibits characteristics of a phishing lure, including being image-heavy with a small file size and containing an embedded JavaScript stream. The presence of numerous external URIs, many of which are on disposable domains, further supports this. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to a malicious site or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://adhdesign.de/userContent/files/20210907222333-79185798777.pdf In PDF document text
    • http://isitekmuhendislik.com/userfiles/file/kemijumuwotu.pdfIn PDF document text
    • https://ms2oke.com/contents/files/40578197355.pdfIn PDF document text
    • http://xn--80aa5alfu.kz/file/kowolokudowokebina.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210906080604167.pdfIn PDF document text
    • http://railwaysrailroads.com/upload_files/files/49722684111.pdfIn PDF document text
    • http://tauroconsulting.pl/userfiles/file/pasoxaxopulij.pdfIn PDF document text
    • https://hopclickhospitality.com/scgtest/team-explore/uploads/files/26660915653.pdfIn PDF document text
    • https://nepalonetours.com/userfiles/files/fibuturixurevuzuka.pdfIn PDF document text
    • http://workontext.ru/media/file/gesibo.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/161328767720fd---xolemexuxatoxitadak.pdfIn PDF document text
    • https://infotechloyalty.com/bot/ckfinder/uf/files/bixezivuwavinoraduwujafo.pdfIn PDF document text
    • https://pakianco.ir/data/image/uploads/news/files/simusivesifek.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/c4b2389e2ef95c0cdd62e00eaa736bb2/getarejobemubovemej.pdfIn PDF document text
    • https://kede.org/userfiles/file/38095168799.pdfIn PDF document text
    • http://air-ned.com/uploads/files/gelivejipafar.pdfIn PDF document text
    • http://xn--90afqerdlt1f.xn--p1ai/admin/ckfinder/userfiles/files/13669811896.pdfIn PDF document text
    • https://kham.vn/userfiles/file/dibanowexafopipisi.pdfIn PDF document text
    • http://turatabor.hu/media/returuto.pdfIn PDF document text
    • http://irths.com/upload_files/files/dosim.pdfIn PDF document text
    • http://greenglobepms.com/uploads/ruwuvekejogalopi.pdfIn PDF document text
    • https://keiba-like.biz/js/ckfinder/userfiles/files/kexixapevakapatemituda.pdfIn PDF document text
    • http://moscowprice.com/content/xuploadimages/file/13097136345.pdfIn PDF document text
    • http://azinsaghf.com/cache/fck_files/file/71642980550.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=first+order+partial+derivatives+calculatorPDF 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_off0000b262.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB262 13744 bytes
SHA-256: c0566e032c74e08e7a568b52345d3db8bf42147c559df3005cdc0faea6086a8a
font_01_sfnt_off0000d3eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3EB 10548 bytes
SHA-256: ddea7846c67a8383b60ec7a2d23a02d5cee8c8744531fd8fd4eb96cd65a8da36
font_02_sfnt_off0000ec1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC1D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1