Malicious PDF — malware analysis report

Static analysis result for SHA-256 a68fadaf8b844d40…

MALICIOUS

PDF

92.5 KB Created: 2021-03-14 03:04:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 670d4b883edbee0072007a59d7e34b10 SHA-1: e6b1348fd6c905de28ec364fed0aebc292ea5ac2 SHA-256: a68fadaf8b844d40e1085b97ef6af0ab79e578f1d324ebed58c47e3ce423bfb8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://leonvi.ru/123?utm_term=fracture+risk+assessment+tool+pdf PDF link annotation
    • https://cdn.sqhk.co/kasigabuzu/icup0Zb/putotutenurojawera.pdfIn PDF document text
    • http://blognews.top/mizixinenalodipeje1d6e.pdfIn PDF document text
    • http://netlysy.online/zurich_balanced_managed_ap_fund_fact_sheetr8yyg.pdfIn PDF document text
    • https://cdn.sqhk.co/kujusiru/IgdBuhe/72949316008.pdfIn PDF document text
    • http://lnstagramverifiedsbadgeforms.com/3ds_max_tutorial_booksrxro1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444649/normal_600cc2c0c3604.pdfIn PDF document text
    • https://vemubofopelo.weebly.com/uploads/1/3/0/7/130776521/visapuw-vadigupoxerisez-mesavuzo.pdfIn PDF document text
    • https://guvolobojifo.weebly.com/uploads/1/3/4/7/134733869/fa704c605c8344.pdfIn PDF document text
    • https://cdn.sqhk.co/kevovevude/e3Lgfn9/23151726980.pdfIn PDF document text
    • https://cdn.sqhk.co/fuluzagile/bhjzUjc/peranuridem.pdfIn PDF document text
    • https://guwubujurod.weebly.com/uploads/1/3/1/4/131438509/5753466.pdfIn PDF document text
    • https://cdn.sqhk.co/mojubemuwek/fT4hahb/77428687309.pdfIn PDF document text
    • https://senidexug.weebly.com/uploads/1/3/0/7/130775540/2559002.pdfIn PDF document text
    • https://xovesoxak.weebly.com/uploads/1/3/0/8/130813458/pixukoxasafasi.pdfIn PDF document text
    • http://formverifiedbadge.com/40565816975o6liu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446394/normal_604472e7d793f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375509/normal_6025757eaae88.pdfIn PDF document text
    • http://fito4ka.xyz/afsc_listq2fto.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/720497f8-3557-4e04-9747-1466a4b5d1bf/40839337029.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03696f47-c2dc-4457-90e4-9d8f9d8e8b03/how_to_sign_in_on_lorex_cloud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9cca3e0a-c9bd-4d49-9ea9-9027ed5b200f/how_to_calculate_moles_of_one_element_in_a_compound.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/feef9f8f-6eb1-4493-9e9c-9ee744c96510/which_is_the_best_topic_in_finance_for_research.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off000148e3.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x148E3 17660 bytes
SHA-256: 25b41b1ba37e1e90e07f5d4248f558c2b850d976e2d5c7427c0adfaef9cf4289
font_00_sfnt_off0000f99a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF99A 8644 bytes
SHA-256: 7d4baf59e2f0b64b750e088c893ec1b87c8a99b40d718aebfc9f276d876caaa3
font_01_sfnt_off0001104f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1104F 5320 bytes
SHA-256: f5696efd9ea9fa9d1f69918019d1cd185cb291c3c2b4673beccd160babb63121
font_02_sfnt_off00012257.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12257 11580 bytes
SHA-256: 4ac506720bf6f2f29c271eaa22da635639174abf141b02951930e488ebfbb8bc