Malicious PDF — malware analysis report

Static analysis result for SHA-256 c611282f1793d562…

MALICIOUS

PDF

87.1 KB Created: 2021-03-27 11:24:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 8a334cfe32483c83b3f8ed67a436fc91 SHA-1: 82bcbfb9fd82e46ad269ac943c3c2c0da0123eeb SHA-256: c611282f1793d5624d2b5fd477cd66686288191a538f096d6c0afe48dfb9b1a4
184 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to known malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, appears to be a lure related to a home loan application, suggesting a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://crophysi.ru/123?utm_term=aditya+birla+home+loan+application+form+pdf In PDF document text
    • http://salonly.xyz/how_to_model_character_head_blenderypeql.pdfIn PDF document text
    • http://custits.space/rcbs_chargemaster_1500_combo_dust_covero78x4.pdfIn PDF document text
    • http://instapriz365.online/braun_exactemp_service_manualkulht.pdfIn PDF document text
    • http://teachost.com/what_are_the_4_basic_principles_of_the_declaration_of_independence57yrf.pdfIn PDF document text
    • http://b2b-servis.ru/wugamiz2pka.pdfIn PDF document text
    • http://rawoferifexa.22web.org/fozepufude.pdfIn PDF document text
    • http://miiliioner.xyz/definicion_del_arte_segun_aristotelesea3ol.pdfIn PDF document text
    • http://fifamarketbot.com/what_is_big_data_analytics63mrt.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://11ab4cf5-156d-4417-99e9-5039b2a7eb5f.filesusr.com/ugd/82d61e_0e598ad0c7e042e796fd5cfb1ea1555a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9be724d1-f3df-49cb-968d-9e7653e09dd8/can_python_be_used_for_data_analysis.pdfIn PDF document text
    • https://1682489e-d94b-4f22-b6a6-c8ecb623ca2e.filesusr.com/ugd/5f226e_718d8d9535cf4794911748b384a9bbe1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4eed1d60-6f23-4f2e-9da6-565b99e60f0e/77502805550.pdfIn PDF document text
    • https://s3.amazonaws.com/sevoga/cheech_and_chong_next_movie.pdfIn PDF document text
    • https://52ed6390-a5c1-4502-9f93-599cf6d98ad1.filesusr.com/ugd/f7fbc8_7d51c2b4897b4d25b9912b950911c728.pdf?index=trueIn PDF document text
    • http://kalotiwinilobiw.epizy.com/87223164636.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/555f8d5c-8fc1-4f28-a35d-1a3e5fa2f81f/644653955.pdfIn PDF document text
    • https://s3.amazonaws.com/rurosaveruk/meaning_definition_of_academic_performance.pdfIn PDF document text
    • http://sujotoginejo.rf.gd/bd_police_application_form.pdfIn PDF document text
    • https://7f1158f2-e44e-4cac-991a-806210d1dc3e.filesusr.com/ugd/e4a8e1_2e6064baf6354ade975276a9b7bababa.pdf?index=trueIn 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_off0001179a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1179A 5448 bytes
SHA-256: 8d6d8691df29d19d3394195504f4a61f6e912487b3f9e02b6966fca31fda8ec4
font_01_sfnt_off000129fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129FC 10892 bytes
SHA-256: 20412b1c603247df0326f03fd7c0a3c2a3ab575354c5652fd2d08faf9d2dc0f4

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