Malicious PDF — malware analysis report

Static analysis result for SHA-256 017f7a8cd0e2e2a7…

MALICIOUS

PDF

76.2 KB Created: 2021-03-10 22:50:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: f8c23048dc80e5f27a7cfb900cccc035 SHA-1: c4e66e241c6ebab768a0bba6ec62048d9aee735d SHA-256: 017f7a8cd0e2e2a76db856718f24550b9eb8eefd1a8a65ca3e3a822940810ad1
184 Risk Score

Malware Insights

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

The sample was flagged by multiple heuristics as malicious, including a critical finding for linking to known malicious redirector infrastructure. The ML classifier also returned a high confidence score for maliciousness. The document body contains garbled text, suggesting it is not intended for direct user consumption but rather to host links. The presence of numerous URLs, many pointing to disposable hosting and employing UTM parameters, indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://dafemum.ru/123?utm_term=aladdin+disney+story+book+pdf In PDF document text
    • http://tinubawolu.mywebcommunity.org/zugafug.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415544/normal_5ffeb8ad3e795.pdfIn PDF document text
    • http://mifirejetevina.getenjoyment.net/67122562777.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426812/normal_5fd76140ec09e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4502817/normal_5fdcc86b98f9e.pdfIn PDF document text
    • http://mamuzomilap.iblogger.org/math_in_chemistry_charles_law_worksheet_answers.pdfIn PDF document text
    • http://netopodimamo.mywebcommunity.org/57826202956.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405206/normal_6015b86b12f81.pdfIn PDF document text
    • http://worozoxiw.sportsontheweb.net/wesawaregojupobusomu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417122/normal_60154e8959419.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lodonevubepivor.epizy.com/intermolecular_forces_practice_worksheet_with_answers.pdfIn PDF document text
    • http://fujeraxujixu.epizy.com/40872523930.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f79831d9-df74-46f5-88e0-67886c9f8d40/are_we_equal_before_the_law.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c292cdb-37bb-4201-a956-ccc6a18e5a65/39044584181.pdfIn PDF document text
    • http://sozidimimu.rf.gd/67350123804.pdfIn PDF document text
    • https://s3.amazonaws.com/jovekus/93433805288.pdfIn PDF document text
    • https://5b2b9875-3923-4577-9ef6-0527498c95e7.filesusr.com/ugd/4e6dd5_3d96edf6d45040e2b07ac84819dcaab7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fidefofudi/can_samsung_galaxy_tab_s6_charge_wirelessly.pdfIn PDF document text
    • https://71a0d42b-91d5-4e94-9338-ff69ca8a624b.filesusr.com/ugd/e5d5e5_768ac49b17c24350a67ac10290b5df5b.pdf?index=trueIn PDF document text
    • https://6cda4dd4-8aac-43e7-8003-7c0eea9f7907.filesusr.com/ugd/34e26e_c46b45cd7acd4f5390834cb81fa1f0b3.pdf?index=trueIn PDF document text
    • https://238a82c5-85a8-4641-a991-2f0f5270ddc4.filesusr.com/ugd/63f22d_9a9a40c2e42249dbafd2c9be6c2465f1.pdf?index=trueIn PDF document text
    • http://xenezipulugiji.atwebpages.com/dilifuburune.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECFB 5332 bytes
SHA-256: 64ee2eeccc148e8d858d46a2eb9f0f48c6de1184b96788186b132eb533ba4416
font_01_sfnt_off0000ff2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF2E 10668 bytes
SHA-256: 55a65e81ebdde2e928e4a8b6b2928e128a1dbe0d730e697cea2e9e3590f28872