Malicious PDF — malware analysis report

Static analysis result for SHA-256 d34f132f25b3f739…

MALICIOUS

PDF

69.2 KB Created: 2021-09-24 16:52:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6e8674a2c06fcc54a02fd25e3011cd88 SHA-1: 8e6760158a14b89a7db0189e296832e2c13271c4 SHA-256: d34f132f25b3f739763a1c29593b60d780c0d8e4dcbd8f2fe92fbabbdb8bf162
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, with several heuristics flagging it as a link farm on disposable hosting and pointing to algorithmically-generated URLs. ClamAV and ML classifiers also identified it as malicious, specifically a phishing trojan. While no scripts were explicitly extracted, the PDF structure and link patterns suggest it's designed to redirect users to malicious sites, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://stensoproject.com/userfiles/files/ririrawalu.pdf In PDF document text
    • http://officinedesign.it/userfiles/files/43720288956.pdfIn PDF document text
    • https://mehreganimaging.ir/images/upload/files/wezijugo.pdfIn PDF document text
    • http://chukysovin.com/img-svc/files/42239892129.pdfIn PDF document text
    • https://netiko.fr/img/Data/file/408814950.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/16137fbc9a1b23---90443555570.pdfIn PDF document text
    • http://vivo-mebel.ru/upload/file/fatagudilut.pdfIn PDF document text
    • http://bagliodeimille.it/userfiles/files/6106903745.pdfIn PDF document text
    • http://asu78.ru/userfiles/file/nekemivekowazodatarul.pdfIn PDF document text
    • http://bratislava.topenglish.sk/app/webroot/gallery/files/sogusi.pdfIn PDF document text
    • http://www.giuseppe.ru/ckfinder/userfiles/files/81552228883.pdfIn PDF document text
    • http://varadimasszazs.hu/uploads/files/11260271731.pdfIn PDF document text
    • https://valenciamaids.com/userfiles/files/sujin.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/c1e63dfd14a13f953e9d24e5f2d1477b/ripodigagesuzozujimeker.pdfIn PDF document text
    • https://pratham.one/file/88037805426.pdfIn PDF document text
    • https://terrebleue.org/userfiles/file/80402165353.pdfIn PDF document text
    • https://australiancaravancentre.com.au/application/third_party/ckfinder/userfiles/files/67853005885.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/wedojixariloridemopimir.pdfIn PDF document text
    • http://carraracucinecomponibilitrapani.it/userfiles/files/55942980048.pdfIn PDF document text
    • http://www.frank-diagn.hu/userfiles/files/88947174155.pdfIn PDF document text
    • http://balbu.hu/uploads/news/file/84429856066.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=outreach+365+loginPDF 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_off0000ae68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE68 10940 bytes
SHA-256: 74aaaf169034672e0d78a409e2a283eadd8b3666fbdaf2b750ab828a7efbd459
font_01_sfnt_off0000c7cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000dfdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFDD 14968 bytes
SHA-256: c985409bf77eda24d072a501bbd24d708dbeb94d0dbd38015e333780532c5fc1