Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e9384bfa3544a5f…

MALICIOUS

PDF

85.5 KB Created: 2021-05-13 08:17:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: c9782c04b180588a6eafacd8ab40f7e9 SHA-1: 92d0be6610f431aaba6aaa820bd867639d52191e SHA-256: 3e9384bfa3544a5f006faecf103ccac8fc946f39f1fe01d342c5b26fe031eabd
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded links that redirect to a malicious domain, identified by heuristics as a malicious redirector and part of a link farm on disposable hosting. The ML classifier and ClamAV also flagged this PDF as malicious, specifically as a phishing trojan. The document body, though heavily obfuscated, appears to be a lure related to a search query, further supporting a phishing or social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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 links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than 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.
  • 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://crophysi.ru/strik?utm_term=how+do+you+connect+wireless+mouse+to+ipad In PDF document text
    • http://pifofobexaxel.mypressonline.com/blessings_laura_story_piano_sheet_music.pdfIn PDF document text
    • https://tagakokiginozol.weebly.com/uploads/1/3/0/7/130775172/6125da5b40d.pdfIn PDF document text
    • https://lisopivoxo.weebly.com/uploads/1/3/4/9/134901835/sadonava.pdfIn PDF document text
    • https://povefedonigo.weebly.com/uploads/1/3/1/6/131637150/22379d61201a.pdfIn PDF document text
    • https://zotagozugub.weebly.com/uploads/1/3/0/7/130739891/gegifo.pdfIn PDF document text
    • https://zeruxukekojumu.weebly.com/uploads/1/3/5/3/135345771/4284298.pdfIn PDF document text
    • http://kulotufiw.mypressonline.com/64844580439.pdfIn PDF document text
    • https://sadusanolomu.weebly.com/uploads/1/3/4/6/134646393/5175208.pdfIn PDF document text
    • http://tigibisolefora.mygamesonline.org/big_little_lies_season_2_finale_date.pdfIn PDF document text
    • http://bufezipuduxev.mywebcommunity.org/hot_wire_anemometer_theory.pdfIn PDF document text
    • http://wusator.mygamesonline.org/25682330794.pdfIn PDF document text
    • https://pilonalamajavex.weebly.com/uploads/1/3/1/1/131164122/c4069ce9b9e08.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/26c599e0-2bdb-44ac-bd8b-4783c1f5bfed/28647465721.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d25c80f5-0ffd-4a39-b68d-97e6f9d547d5/40054489992.pdfIn PDF document text
    • http://mifijikamipupu.epizy.com/pirates_of_caribbean_movie_in_tamilrockers.pdfIn PDF document text
    • http://rovizomaguwex.atwebpages.com/xigevujijuvido.pdfIn PDF document text
    • http://xebojipex.epizy.com/38523770801.pdfIn PDF document text
    • http://buwomonemagup.epizy.com/interpreting_circle_graphs_worksheet.pdfIn PDF document text
    • http://ramawotinejog.epizy.com/vikudu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67b6352f-10cc-4541-83ca-3ab725144654/69733949532.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3cdc3f90-4cc4-4c27-93dd-c90435a4cb23/6326894812.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f90ed6a9-0036-40be-9f77-cfd08d4b87d3/popinuwedexafuxoregagu.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://scripts.sil.org/OFLIn 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_off0000f8cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8CD 5376 bytes
SHA-256: 6e6a482c5a5f8a542a65a2daad9bc33a5354e2c1cc3b08a5fc93981cdc6a7379
font_01_sfnt_off00010b10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B10 10984 bytes
SHA-256: d64a4504810396942bdc367a410723c1f30ce6bd2e22d1c2651b87bb4351223e
font_02_sfnt_off00013080.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13080 16396 bytes
SHA-256: b59fbf4de48dd8aa3d96adf847c97080a63991bb53c972061d95bb3759270fd7