Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c51ded41bf66309…

MALICIOUS

PDF

74.4 KB Created: 2021-03-02 15:25:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: b818f61ef262bb16897dda740fec5176 SHA-1: b1dd2e56f543274c372db73d53facba027b54225 SHA-256: 5c51ded41bf6630980036a85af3695b98df606a7f111d2d0348d1f23e6b25bec
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 0.9998

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://vilenefex.ru/strik?utm_term=define+doctrine+of+discovery PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4375504/normal_5fdac818c80e8.pdfIn PDF document text
    • http://drilltech.info/can_you_sleep_in_monthly_contact_lensesjg7gj.pdfIn PDF document text
    • http://fesunasisodenod.getenjoyment.net/riworasa.pdfIn PDF document text
    • http://vsspb.ru/balanceamento_por_oxirreduo_exercicios_resolvidos4lvvq.pdfIn PDF document text
    • http://vinnipoh.space/sia_chandelier_piano_versionkf0i9.pdfIn PDF document text
    • http://pokezokebawi.mygamesonline.org/57225853457.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487623/normal_603196765fb65.pdfIn PDF document text
    • http://sutiboju.sportsontheweb.net/vefusuxagofiwu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384831/normal_5fe2c63e46ddb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454559/normal_60246198b8af3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/lixuzo/autocad_2018_xforce_keygen_64_bit.pdfIn PDF document text
    • http://juludiripo.myartsonline.com/does_the_raven_method_work_for_shifting.pdfIn PDF document text
    • http://kilarosine.atwebpages.com/timuxubafovelifabiz.pdfIn PDF document text
    • http://vilepobafomunow.atwebpages.com/is_breville_air_fryer_good.pdfIn PDF document text
    • https://s3.amazonaws.com/xefejevife/velid.pdfIn PDF document text
    • https://s3.amazonaws.com/zufojadibi/maplestory_reboot_link_skill_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/forupokisip/gigubogawimobirodari.pdfIn PDF document text
    • http://gegurobaz.myartsonline.com/why_does_it_feel_like_ice_is_running_through_my_veins.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_off0000e7b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7B6 4932 bytes
SHA-256: f27731eb6aa79c7c6c44c8c471f6cb2965b656af08e026eb7094567cdc3b9c59
font_01_sfnt_off0000f8a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A9 10500 bytes
SHA-256: b1cf7c6f38aba6f723d940175489cf4b5ef3c1863bdd3592fa8de77dcb330fe3