Malicious PDF — malware analysis report

Static analysis result for SHA-256 30b5168dc8704347…

MALICIOUS

PDF

81.4 KB Created: 2021-04-02 11:54:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: f45f0b6e5774f4849641f9e2d0779212 SHA-1: 76942bf41a20bc1385a686e9d0bb7b07db8d693e SHA-256: 30b5168dc8704347c22d905f38e88883e14e05ac8b7e85cd9887c46cfd0277cc
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with a critical heuristic identifying a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, suggests a lure related to a 'Catecismo de la iglesia catolica pdf 2020 gratis'. The presence of embedded URLs and the ML classifier's high confidence score indicate a malicious intent, likely to redirect users to a phishing or malware download site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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/award?keyword=catecismo+de+la+iglesia+catolica+pdf+2020+gratis In PDF document text
    • https://cdn.sqhk.co/kisesawaropo/cmhfiin/83480083422.pdfIn PDF document text
    • http://pusatokolerax.mywebcommunity.org/action_research_in_education_a_practical_guide.pdfIn PDF document text
    • http://fubikopelemom.mypressonline.com/can_i_replace_my_optimum_modem.pdfIn PDF document text
    • http://dukepiweg.iblogger.org/examples_of_safety_procedures_and_instructions_you_would_be_expected_to_use_in_the_workplace.pdfIn PDF document text
    • https://cdn.sqhk.co/topazawu/ebLxjbj/tebadijebupuzoxik.pdfIn PDF document text
    • http://nexofozupugasi.mywebcommunity.org/97024933140.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8909b315-4d59-4940-aabf-0fdaa532e0ad.filesusr.com/ugd/4542d9_0bd31b516bba4aa7b2aa3a588db9cc0b.pdf?index=trueIn PDF document text
    • https://123949be-7110-4ba3-a240-a7df06fb38ce.filesusr.com/ugd/80fd5d_620fe2e3daaa469eaee6a0a6a15c3c08.pdf?index=trueIn PDF document text
    • http://pefimubis.myartsonline.com/13160967284.pdfIn PDF document text
    • http://tolamepaduxeju.rf.gd/glioblastoma_multiforme_grade_4_life_expectancy.pdfIn PDF document text
    • http://sajoveguduv.onlinewebshop.net/58138903460.pdfIn PDF document text
    • https://77483064-5892-4b52-b419-66e751946b77.filesusr.com/ugd/ef7b09_a0b2274247e745d09f5c78c04f4c7345.pdf?index=trueIn PDF document text
    • http://zalezir.epizy.com/charles_darwin_summary_biography.pdfIn PDF document text
    • http://fuluxewamotate.atwebpages.com/tamomafudojax.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e322318-97dd-4bea-a283-a5b6c783979e/craftsman_snowblower_manual_parts_list.pdfIn PDF document text
    • http://dovunufesesiz.onlinewebshop.net/fogexajupokowotixaji.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19842f8c-3718-4bb5-a7c6-6f77e4bfb945/algebra_1_for_dummies_cheat_sheet.pdfIn PDF document text
    • https://8be317c1-93d6-4444-9a1c-030c84ae583f.filesusr.com/ugd/709942_6f8f294d69b14c14939479d9cd3c4a9e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef185ac9-33e1-467e-b90c-4f7146b7c1e2/dream_quest_of_unknown_kadath_tv_tropes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7433b74d-952f-4b50-a924-77d886320b37/61702909013.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb55dc09-24ed-4a41-b37a-482daeef3a97/how_many_carbs_are_in_a_burger_king_medium_fry.pdfIn PDF document text
    • https://28f2c00a-638b-45ec-8848-4d649cb6aba9.filesusr.com/ugd/946f28_0c5131a88c434edcb54e369d49a723d1.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_off0000fc4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC4F 5652 bytes
SHA-256: 7874cb475eece043402277e80a5135814e66500971d81d89d0a2180a2c8dab52
font_01_sfnt_off00010f7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F7C 11960 bytes
SHA-256: bcf3728394c940688489f06129ee889a6ed86c98d5d216e90ea35a2ef54aced8