Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f6b1154511dab3d…

MALICIOUS

PDF

77.4 KB Created: 2020-12-23 13:54:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: f8390cab3a4fb0893fccdf46ff4a57cb SHA-1: 107645ee92099baaee7e9554face0d8ebc1b4cd1 SHA-256: 4f6b1154511dab3d07bc544ccd3b099584190e97b4c4d3127a949af2603b8669
214 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, many of which point to potentially malicious redirector infrastructure. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_LINK_FARM indicate a deliberate attempt to create a link farm, likely to distribute malware or conduct phishing. The ClamAV detection and ML classifier further support its malicious nature. No scripts were extracted, but the embedded links are the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://gettraff.ru/aws?utm_term=marvel+ultimate+alliance+3+game+informer In PDF document text
    • https://pufukowog.weebly.com/uploads/1/3/4/5/134583281/fuforozinefabeva.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444850/normal_5fd11286e83f3.pdfIn PDF document text
    • https://tilotifibow.weebly.com/uploads/1/3/4/5/134505855/9a649.pdfIn PDF document text
    • https://wiwovadale.weebly.com/uploads/1/3/5/3/135322143/12721ba53a50b50.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/26e501f2-5962-4e62-bfa9-95356f6341ce/mobogenie_app_download_apk_old_version.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/119d1a4b-6dc9-448f-b094-9f88cac65a2c/disappearing_9_patch_baby_quilt_tutorial.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0050d260-7c98-407f-9192-65e96fee8cbb/48706503486.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0bc6dc12-a307-4957-b649-c45e6a520797/65905716339.pdfIn PDF document text
    • https://s3.amazonaws.com/defujo/42378460380.pdfIn PDF document text
    • https://s3.amazonaws.com/sefepugolupalax/sojasiw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d97dc136-1c50-4fa6-9618-145052427e2f/telana.pdfIn PDF document text
    • https://s3.amazonaws.com/bagisi/journal_entry_report_in_quickbooks_2018.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98e9574d-b92c-4a86-a5d3-eb5c165db937/vehicle_blackbox_dvr_1080p_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/caf8c34f-247f-4fc9-88b8-87664f9eda2e/ewok_elder_mods.pdfIn PDF document text
    • https://s3.amazonaws.com/gasodamuza/2018_calendar_canada.pdfIn PDF document text
    • https://s3.amazonaws.com/wazagidonux/tijikijo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4183fd4-8eed-488e-b029-3e8de0921016/16234306368.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2E4 5252 bytes
SHA-256: 3ae2c89e6f97c33c83aaff011f5826609d66133553f8810ebff952f1297dbf2f
font_01_sfnt_off0000f4c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C7 10608 bytes
SHA-256: 5028053428788be8932efd981940918c8cadca9afac6db09a3acb6f18eb34156
font_02_sfnt_off0001190a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1190A 6128 bytes
SHA-256: 7b4eb8d14f29588e3896155be438c9309611e47e3fec554f92fc966acd51ce8e

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