Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bab56a8a68a64bb…

MALICIOUS

PDF

87.3 KB Created: 2021-03-20 01:12:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 30cd9f056b39695ae8737946cd68336a SHA-1: f142a6d4c95779528cceb84df46d683b5b7f28eb SHA-256: 4bab56a8a68a64bbeb36603cef6e4b8ea5929fa75144237268b0eb932cdb60be
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically identified as a known malicious redirector. The document body, though heavily obfuscated, appears to be a lure related to book searches, aiming to trick users into clicking malicious links. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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/strik?utm_term=what+book+comes+after+the+celestine+prophecy In PDF document text
    • https://pusasosabuni.weebly.com/uploads/1/3/4/6/134654602/fejuka_debama_lopomolujamube_gatufedeviko.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449405/normal_5fede808c86ac.pdfIn PDF document text
    • http://virepidutajal.iblogger.org/lidipevasugedisujefojuxuz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445742/normal_603c0ee89a3a3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501989/normal_5fd1c4fd931c8.pdfIn PDF document text
    • https://tizezesi.weebly.com/uploads/1/3/4/0/134041120/ac0fea59e59fc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458616/normal_5ffd371534d54.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404292/normal_602b2e093b812.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485929/normal_60552cbfd98ad.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451971/normal_5fe5f0922c6fa.pdfIn PDF document text
    • http://zazipirumipez.22web.org/zifulagokojix.pdfIn PDF document text
    • https://mafeguviwu.weebly.com/uploads/1/3/1/4/131407057/0a5df22062d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421970/normal_6052c137ce8a0.pdfIn PDF document text
    • https://zeregosuw.weebly.com/uploads/1/3/6/0/136055393/dolukufu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rasujej.rf.gd/kamotor.pdfIn PDF document text
    • http://rutegoba.epizy.com/lisofaxonowaditozag.pdfIn PDF document text
    • https://s3.amazonaws.com/dudujopixejikug/article_1315_du_code_civil_rforme.pdfIn PDF document text
    • http://sasugud.rf.gd/87858306012.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b127aa6d-7baa-40da-997a-8faa46a54bd0/migomodugorasabozapodaf.pdfIn PDF document text
    • https://s3.amazonaws.com/kobivimelelo/16382109796.pdfIn PDF document text
    • https://s3.amazonaws.com/lawakux/rujokipupogoniwejisugex.pdfIn PDF document text
    • https://s3.amazonaws.com/goneduzum/what_documents_are_needed_to_get_cdl_permit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e09170aa-28a7-4d98-85d3-b12eff996a7b/the_maze_runner_book_setting.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b261e663-68c8-47f1-892a-6bca50c57984/motorola_t200_talkabout_radio_review.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_off000114b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114B5 5576 bytes
SHA-256: 27ea9daaac725fc2e3f30a3019ff46f4752ca17a3a21f87b2b3964cd2f52e7f6
font_01_sfnt_off00012792.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12792 11788 bytes
SHA-256: b50084965d450421125e1427506431bda059961597841dcbcbef78af16f50fa0