Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d4193d5a80d3197…

MALICIOUS

PDF

78.5 KB Created: 2021-03-09 18:05:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 38b0f6ee9fba9312ed87625c81a2957d SHA-1: f6ff031efb0a74a63e2f2c3a659006ef5cf7f68b SHA-256: 7d4193d5a80d31971fb5a3e14415791a608c88e1d91b8fe3bd89dac94a7f53d1
184 Risk Score

Malware Insights

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

This PDF file is flagged as malicious by multiple heuristics and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded links, with at least one pointing to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text related to 'Android device manager unlock broken screen', suggesting a lure to trick users into clicking malicious links. No scripts were extracted, but the presence of malicious links strongly suggests a phishing or redirection attack.

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://yafferge.ru/123?utm_term=android+device+manager+unlock+broken+screen In PDF document text
    • http://mikrotikwizard.com/netflix_movies_2020_fifty_shades_of_greyx71dc.pdfIn PDF document text
    • http://infonewstravel.com/67529417432frh8u.pdfIn PDF document text
    • http://purpless.vip/samsung_s21_ultra_release_date_verizonpptsx.pdfIn PDF document text
    • http://jozipuvuwuzaj.mywebcommunity.org/mahasatipatthana_sutta_book_sinhala.pdfIn PDF document text
    • http://xeboxemovev.66ghz.com/self_rating_depression_scale.pdfIn PDF document text
    • http://zilofunawoson.iblogger.org/betivutuleroluse.pdfIn PDF document text
    • http://lishop.site/taurus_man_secrets_read_onlinew4mse.pdfIn PDF document text
    • http://mexicotop.xyz/zosabebufomijijexvh98p.pdfIn PDF document text
    • http://fb-copyright-help-from.com/sibuzipanefifobiriruj6s7iw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/ca47f533-0ced-4654-addf-0f6e6a126209/english_grammar_notes_class_10.pdfIn PDF document text
    • http://beperedusewigu.epizy.com/vizefabozalemaw.pdfIn PDF document text
    • http://wubulunonowov.epizy.com/dalufawotegiperawukule.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd4594bf-73e0-43b9-9876-4a97bc73f0f0/41170870316.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40a21a61-61c5-4442-8bae-f1aa7965c39f/how_can_i_check_my_post_office_rd_balance_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd3b8069-c6bb-49d6-8280-f14aede8cd4d/ditigatapozize.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e74dfa0-17a5-4d69-838e-023a3a2016cd/what_are_three_benefits_of_volcanic_eruptions.pdfIn PDF document text
    • http://supuwevul.atwebpages.com/how_to_analyse_quantitative_data.pdfIn PDF document text
    • http://gubadix.epizy.com/thyroid_gland_powerpoint_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a11a3b7d-7b5b-484b-9cb8-8a116a13d94f/evh_5150_iii_50w_6l6_settings.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/90f4c3ec-6e31-42ff-b6f5-43323c799d01/86560910397.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e722.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE722 5312 bytes
SHA-256: 2d21b08a10c6f12ba3ec7547e92f561950e15143d95e56cd440fcb1ac0c3af05
font_01_sfnt_off0000f90c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF90C 10816 bytes
SHA-256: e30046f0e87bcc050cd85e23611a5c1aa7c5562d9eb09f424ef93f1c2be6ff74
font_02_sfnt_off00011ddf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DDF 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230