Malicious PDF — malware analysis report

Static analysis result for SHA-256 48392549fa7563ce…

MALICIOUS

PDF

75.9 KB Created: 2021-03-11 04:32:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 012aefaa24c23c428e8133c13cdbd995 SHA-1: 83d6874cf416776c555fea659c8ef0f1cc72e0af SHA-256: 48392549fa7563ce5fefa199dcf413fba776fdc945e738d68bccc4e80f942fcd
244 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 6

  • 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 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.
  • 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/wix?keyword=chapter+9+stoichiometry+practice+problems+answer+key In PDF document text
    • https://cdn-cms.f-static.net/uploads/4374372/normal_5fd9d6637f869.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380530/normal_60186a52cb942.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483365/normal_600f24bd4951b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464053/normal_601263557ea16.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425504/normal_60027371eb7bc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • https://cd70d4e5-4a1a-4071-96d1-f2415ea5ece1.filesusr.com/ugd/7f46b5_567033d70d17437296f6ba6c9497f77f.pdf?index=trueIn PDF document text
    • http://bojefej.epizy.com/sylas_lol_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87443cc7-f53c-4e2b-b0fc-78f1222b22e4/dometic_8300_awning_parts_diagram.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/299bb174-57dd-41fe-9766-86c5f69b19e5/the_challenge_war_of_the_worlds_2_episodes_list.pdfIn PDF document text
    • https://s3.amazonaws.com/kizugokofo/bmo_life_assurance_company_forms.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12ade534-50e3-4d81-8690-cc9365567ebb/how_do_you_bypass_a_starter_solenoid_on_an_outboard_motor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51e8bcdc-2248-40d6-ac34-3c0da556bc8a/ferimutebegudemodoz.pdfIn PDF document text
    • https://s3.amazonaws.com/dikobepibelun/18844443937.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c3652c3-07e8-43d5-ae5f-9e2783ad09f1/are_strong_acids_weak_electrolytes.pdfIn PDF document text
    • https://288c7b4b-0494-48f6-8ee2-9dd519b96b0a.filesusr.com/ugd/a107db_a8814dc723174881a42e2db11ab3fecb.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/487330a1-6be0-4d72-a463-8adf5ccca73a/multivariate_analysis_of_variance_manova.pdfIn PDF document text
    • https://s3.amazonaws.com/sabegokek/synonyms_list_for_kids.pdfIn PDF document text
    • http://jogalasevoron.epizy.com/criminal_law_vs_civil_law_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc597952-3758-40fa-9ae6-51f496c6747f/definition_of_theoretical_framework_in_qualitative_research.pdfIn PDF document text
    • http://sasofinifujilo.epizy.com/sony_str_dn1050_app.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62a5fc2b-9033-4fb3-9854-7d4a28f028b0/how_to_read_tab_notes_guitar.pdfIn PDF document text
    • https://s3.amazonaws.com/tobojelusiwi/51419850452.pdfIn PDF document text
    • https://s3.amazonaws.com/simujix/77846640076.pdfIn PDF document text
    • https://2cfcb734-ec62-4cd9-b61c-03d4762ad765.filesusr.com/ugd/a891c0_5323f60dcc0a4aa8bb1701d024ffe54a.pdf?index=trueIn PDF document text
    • http://vuxubeso.rf.gd/netdania_mod_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8410cc1-6ab4-4290-a8a4-c54c7c075b88/hp_elitebook_8570w_sound_drivers.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
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dbaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBAA 5632 bytes
SHA-256: 405093a926743459cd744c3772744e5b0f69eb891582f59d9957c07c393ee602
font_01_sfnt_off0000eea8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA8 6068 bytes
SHA-256: d2d10b6b0c668cf26faa9347c7054f8580c7eefa5cb7aecda2a4fba74bd025f0
font_02_sfnt_off0000fe59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE59 10044 bytes
SHA-256: d070ba364daa95ba979296759cfb8041c103baaafddccdf809b9cf084f13ff3c