Malicious PDF — malware analysis report

Static analysis result for SHA-256 08f2ae7f03a06cc4…

MALICIOUS

PDF

85.5 KB Created: 2021-09-20 20:12:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0f201c0f25e7c7bad2e92a4622687dfa SHA-1: a118420bb2c2023cd060777509df68f8378eeacd SHA-256: 08f2ae7f03a06cc43f84b68fd4792b6e7c2f0583f1ac39fd604999675bfe9f1b
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded links, many pointing to algorithmically generated URLs on disposable hosting, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the embedded links and the PDF structure are consistent with techniques used to deliver second-stage payloads or redirect users to malicious sites.

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
  • 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 https://oniceh.ru/uplcv?utm_term=rupaul%27s+drag+race+season+12+free+full+episodes PDF link annotation
    • http://cowmoo.org/ckfinder/userfiles/files/mabirikukolilobij.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c018402cb6---saxevutenisagewurux.pdfIn PDF document text
    • http://iuoooo.com/filespath/files/20210904065313.pdfIn PDF document text
    • https://goez1.com/10005001208290177/ckfinder/userfiles/files/53749968587.pdfIn PDF document text
    • http://csc0898.com/userfiles/file/20210910195512_yhnpy4.pdfIn PDF document text
    • http://ebiocell.com/uploadfile/file///2021091004380019.pdfIn PDF document text
    • http://precisao.net/files/files/7861427954.pdfIn PDF document text
    • http://mclarenquartz.in/ci/userfiles/files/fedibifubokevako.pdfIn PDF document text
    • https://processwork.archerhuang.com/ConImg/files/xewava.pdfIn PDF document text
    • https://bibliothequedesarts.ch/ckfinder/userfiles/files/25100147525.pdfIn PDF document text
    • http://onlinevay.com/upload/files/87533076852.pdfIn PDF document text
    • https://treasurehunterdetectors.solar-ovens.net/ckfinder/userfiles/files/9343614648.pdfIn PDF document text
    • http://goldendoodlesofthesierranevadas.com/userfiles/file/mesuraveruxujoxegupuseduf.pdfIn PDF document text
    • http://studiogiovannone.com/userfiles/files/gewuvo.pdfIn PDF document text
    • http://ventilatoryzlin.cz/images/file/fomodiwipudakose.pdfIn PDF document text
    • http://alanaf.ru/userfiles/files/panedeb.pdfIn PDF document text
    • http://vaynhe.com/upload/files/7095481829.pdfIn PDF document text
    • http://wooshin.kr/uploaded/file/70036121761430d734ed75.pdfIn PDF document text
    • http://woori-tour.kr/FileData/ckfinder/files/20210906_DCC1B63305C49A58.pdfIn PDF document text
    • http://ciaooo.ru/uploades/userfiles/file/39079447342.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/34658565679.pdfIn PDF document text
    • http://zavalinka.by/var/upload/file/76337082990.pdfIn PDF document text
    • https://libyamonitor.com/sites/all/libraries/ckfinder/userfiles/files/mixejojufan.pdfIn PDF document text
    • http://lamorenj.com/userfiles/files/zidikurewaxex.pdfIn PDF document text
    • 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_off0000e6ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6EE 18112 bytes
SHA-256: caf43dfac2bc01bcfca66e83a4a1da9534c31edac30acb1ab58bd325e546386a
font_01_sfnt_off00011647.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11647 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012e5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E5E 11048 bytes
SHA-256: f72115415a354a0b1dca559975cd58b04fd8a354806f0a27b7f141d4b11066a7