Malicious PDF — malware analysis report

Static analysis result for SHA-256 862fd93bb20655f2…

MALICIOUS

PDF

77.2 KB Created: 2021-03-24 05:02:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e823556f79b14aa1491c51b66f6944aa SHA-1: bb9a9271c29c13c4f39f8d627f148ba14b2ec438 SHA-256: 862fd93bb20655f251ebce643e06c773658f23679e8b454830d605758b3706e8
156 Risk Score

Malware Insights

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

The file is a PDF containing a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic. One of these links, https://resalured.ru/123?utm_term=candlelight+song+bhangra+video, is flagged as potentially malicious. The ML classifier and ClamAV also identified this PDF as malicious, specifically as a phishing trojan. The presence of numerous links suggests an attempt to direct users to malicious sites, potentially for phishing or to host further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://resalured.ru/123?utm_term=candlelight+song+bhangra+video
    • https://gumevimarijefa.weebly.com/uploads/1/3/1/0/131071167/2c1326d1.pdf
    • https://jijobowuzum.weebly.com/uploads/1/3/4/5/134590228/muzapoxuwe_tisodake_warelabu_pasoruzofiwew.pdf
    • https://lewotivegil.weebly.com/uploads/1/3/4/3/134320996/juwalopa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://puxetedategekex.epizy.com/93865356167.pdf
    • http://selifesupenikiv.epizy.com/goodwill_impairment_test_reporting_unit.pdf
    • https://uploads.strikinglycdn.com/files/97312086-a05f-4b6a-9f18-a68543124c33/char_broil_red_grill_2_burner.pdf
    • https://uploads.strikinglycdn.com/files/f730086d-b124-480d-8033-2f5a83144bb0/42845776149.pdf
    • https://uploads.strikinglycdn.com/files/b9623f5d-d5eb-4151-9260-779f750ed07c/54059814160.pdf
    • https://uploads.strikinglycdn.com/files/0896437f-6a5e-4277-8edf-e865b3fcb066/safefenawuzuxenezun.pdf
    • https://44eeb0f0-4dc9-4d8b-b3fd-cc7ace98e90e.filesusr.com/ugd/a083a1_38d81276048641a6bc55f80c52d1fdc8.pdf?index=true
    • http://sidakofonol.epizy.com/meaning_of_balance_sheet.pdf
    • https://uploads.strikinglycdn.com/files/3e0c83e4-780e-4803-b875-3bb105e65ad8/tisovixomos.pdf
    • https://uploads.strikinglycdn.com/files/593f1cb8-2bb5-433d-9f46-e979ed87a3d7/30630300324.pdf
    • https://71da2aa5-51c3-4f2c-ab18-08bbbad20131.filesusr.com/ugd/d216cb_bac56d12e63f4ef292ac2b96d43d3e38.pdf?index=true
    • https://uploads.strikinglycdn.com/files/942a438a-8176-4dc9-b982-69c1555d1368/toshiba_32c120u_service_manual.pdf
    • https://uploads.strikinglycdn.com/files/d59277ea-75e5-4cb3-abdd-cacc7a82845c/what_degree_is_best_for_public_relations.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eebd.bin
e1a42869d5ef357cca654dff539c9081e7afb9f2da13ce473925d5ccd8daefeb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEEBD 5192 bytes
font_01_sfnt_off0001005d.bin
27c4891621cb56bbb8cd9d8cbec0046100968bbe071902b08b8301ef25643304		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1005D 11716 bytes

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