Malicious PDF — malware analysis report

Static analysis result for SHA-256 243882a312e169ed…

MALICIOUS

PDF

64.0 KB Created: 2021-05-18 08:41:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: a387e0063fab71b004433affe53d7d51 SHA-1: b1d1b1e722f52c77b60d9d0012127cfbdb902113 SHA-256: 243882a312e169eda64039e4ae5885b20b65237725132c03aa40c3a611516ae4
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

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 0.8602

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 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
  • 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://jumiwimov.ru/strik?utm_term=kerala+learners+test+questions+and+answers+in+malayalam+pdf PDF link annotation
    • http://wibotubegoze.iblogger.org/adobe_photoshop_cs5_advanced_tutorials.pdfIn PDF document text
    • http://ximikilanad.22web.org/astm_a572_a572m-_18.pdfIn PDF document text
    • https://gidutuzewefira.weebly.com/uploads/1/3/1/3/131380066/9cafa9a30.pdfIn PDF document text
    • https://guzokilib.weebly.com/uploads/1/3/2/7/132741743/wamebagukizivuta.pdfIn PDF document text
    • https://funexoxep.weebly.com/uploads/1/3/2/3/132303151/xevitavibezalu_tolud.pdfIn PDF document text
    • https://fomodaduvi.weebly.com/uploads/1/3/4/7/134700625/1853295.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/26dee72d-ebb7-427e-acc2-4785a0fa2d3a/sodastream_fizzi_one_touch_sparkling_water_maker_white_with_mini_cylinder.pdfIn PDF document text
    • http://voferinokubusob.rf.gd/54506636988.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd9e3d7b-a055-43f9-8e3d-a97ba5561e95/best_cross_cut_shredder_for_home_use_uk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0aaf3123-c49a-482f-8a27-82df820f4f73/59541131819.pdfIn PDF document text
    • http://jawuguv.epizy.com/53414473049.pdfIn PDF document text
    • http://digupusulufo.epizy.com/fitbit_flex_bands_canada.pdfIn PDF document text
    • http://narumigopu.epizy.com/setting_time_on_citizen_skyhawk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b6f7992-5ee7-4435-a808-c23043eeafab/what_is_design_thinking_definition.pdfIn PDF document text
    • http://sagovonopa.rf.gd/nisugenedipimovumasumob.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/16cf75bf-f5f7-4232-aaf6-1990d329b672/history_of_philosophy_of_science_journal.pdfIn PDF document text
    • http://tikukolaxu.rf.gd/kaxepurelevo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8184a9d4-8536-422e-a044-1dd623e15be0/7749901830.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3bf0d5b-b9d5-4db2-8ff9-f19e85b8f4d4/fodirimujefe.pdfIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA23 5476 bytes
SHA-256: 520f326a77368ddc0f38a46d4da86921b5ba728b7c52d72f4b722b80b37f2d3f