Malicious PDF — malware analysis report

Static analysis result for SHA-256 b09bdfe06535e5fa…

MALICIOUS

PDF

83.8 KB Created: 2021-05-04 02:31:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: a87b9b2f6d9ac5772fa2eb376dac2e74 SHA-1: dd5d59ca52c00c555d2a858ed36f7cf03f2adc5c SHA-256: b09bdfe06535e5fad5f6fa999fac452c7a37c590a46396ae232cc1299c247dc7
186 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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • 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.
  • 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://fokemale.ru/strik?utm_term=how+to+fold+up+total+gym+1500 PDF link annotation
    • https://cdn.sqhk.co/lakagifoter/kiiPHih/funny_ringtone_ideas_2020.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417534/normal_5fd7cecc882f0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408330/normal_606adc1a6ff6f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473062/normal_5fff7519a4490.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477910/normal_6019ae0d224b1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489979/normal_603beacbe05a2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427523/normal_6051293e637a5.pdfIn PDF document text
    • https://cdn.sqhk.co/surodamiz/YivhbK2/tumblr_lightspeed_soundtrack.pdfIn PDF document text
    • https://cdn.sqhk.co/zasokolof/heKkbid/evil_nurse_scary_horror_game_adventure_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375705/normal_5fe071498d11e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460972/normal_5fcc249c56e10.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492575/normal_602a856e937dc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416493/normal_601bb788b89c6.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/0b8fd549-2111-4cfb-a16a-80abb60606ac/synology_ds1515_processor.pdfIn PDF document text
    • https://599b09cd-7b6a-4758-94a3-08a08d316165.filesusr.com/ugd/628a76_0771751826684e46b32b0e2548c8f9e6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/dee2ab76-823c-4770-9ac5-86c471764c5d/5th_battleship_squadron.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df2400f6-2023-45cb-aa51-a376168cfed0/90359606861.pdfIn PDF document text
    • https://48b7024d-7414-4593-b44d-ed892b96ad15.filesusr.com/ugd/3e5db3_a90e9b239f93492fad19180360468adc.pdf?index=trueIn PDF document text
    • https://ef90beaa-bca2-431e-862c-49c19dd94618.filesusr.com/ugd/06497e_f0210972d9524e44b16d1b914f9fc33b.pdf?index=trueIn PDF document text
    • https://dfa52777-3edb-460f-9b14-ca5101cd4ecc.filesusr.com/ugd/5360f8_b86edd1016f346109ab623aceb65d3f8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/33b1dacd-9074-4890-ac83-deba1e703c83/ingersoll_rand_compressor_oil_capacity.pdfIn PDF document text
    • https://a6668164-4238-4e0d-addb-cc4c62f58fca.filesusr.com/ugd/2dfcca_3867b7be4e1f485183f5871d68d2cd71.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3192d9d0-3d5f-41d4-a833-3e9511bcd34d/what_does_3_beeps_mean_on_a_dell_laptop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f142b74b-0bd4-406f-9098-1067cb3455e2/21769445397.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25008ba1-0b82-4ab8-838c-81ebad5df398/esther_hicks_ask_and_it_is_given_deutsch.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_off00010752.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10752 5560 bytes
SHA-256: 81e3a440a9ee58b08fc4d599de447b09c8b1b095de46f6fdb3ea36fca7d69c33
font_01_sfnt_off00011a5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A5E 11452 bytes
SHA-256: 174d04d20f6c6ee6adaede0b93eb563cde06b3294f5cb0eed42c64f0e953f955