Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb7bda69d8155ef7…

MALICIOUS

PDF

123.5 KB Created: 2021-05-11 11:30:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 9417fe516e30322f11e266e56815276d SHA-1: 85834d1e1f7c3be1abeeaa397813b316c2fa7ce7 SHA-256: fb7bda69d8155ef739e352054334273a25637ee6beabbe10e50761bdb28c88bd
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a link farm, hosted on disposable domains and redirectors. This behavior is characteristic of phishing or malware distribution campaigns. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to exploiting PDF vulnerabilities to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://zajinet.ru/strik?utm_term=strong+concordance+111 PDF link annotation
    • https://cdn.sqhk.co/jinubodilev/ejhicHa/gravity_payments_revenue.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/2fjdugc/candomble_religion.pdfIn PDF document text
    • https://fabuduviwanor.weebly.com/uploads/1/3/4/7/134739750/dewumowutu.pdfIn PDF document text
    • https://cdn.sqhk.co/mafowixodi/a5Gjjgj/derunisuz.pdfIn PDF document text
    • https://zexotanus.weebly.com/uploads/1/3/0/8/130873712/6476cae815118ce.pdfIn PDF document text
    • https://xabizukilitexe.weebly.com/uploads/1/3/4/3/134335342/7338749.pdfIn PDF document text
    • https://cdn.sqhk.co/xinefegepe/fCkTmhd/uefa_champions_league_quarter_final_fixtures_2020.pdfIn PDF document text
    • https://fixogamirumi.weebly.com/uploads/1/3/4/7/134715439/xifozamodobuxepixi.pdfIn PDF document text
    • https://zupavuzinopaz.weebly.com/uploads/1/3/4/2/134265708/romekokepibibevame.pdfIn PDF document text
    • https://cdn.sqhk.co/wodabakope/jemgeDC/marketplace_mall_food_court_hours.pdfIn PDF document text
    • https://japabipamas.weebly.com/uploads/1/3/4/4/134434218/290f99e8450.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/e68c6e41-e52b-488d-a945-e5052704ad06/xanefobugenum.pdfIn PDF document text
    • https://cb0508fd-2a1f-4901-a161-a76823ee8e4f.filesusr.com/ugd/52013e_6c92cb5c86fe485a8ae6718596cd7f5d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3829ba7d-c126-42bc-8db2-1322c1321d6d/77066607503.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83c61f55-3dcd-4d30-9af2-5d970c8d17b5/mugeguzo.pdfIn PDF document text
    • https://5e652c44-c8a2-4170-8b63-1f74ea172bc2.filesusr.com/ugd/78c764_f2c0b0bf4f384620b9c8d998f0c71d61.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a1ced20-5cfd-4e03-9f7b-4dcd11c5bae1/43333634853.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce7b8aa9-753a-4499-8962-68fb7985bc22/slouchy_beanie_crochet_pattern_for_beginners.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb261ebe-2ac6-4e91-8574-6ffb5a21a946/13999734571.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0a724a9-aeac-431c-98ba-4dd989d92bb3/jogebibofekojawa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f285a14-03b8-4ccc-ab1a-6f146bf72fb0/what_are_the_three_different_stages_of_cellular_respiration.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00017797.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17797 4792 bytes
SHA-256: 1261aaee815e2c242b5b1ff4d5f11a5102765a2639de0e47e187d90ed3ad4fa8
font_01_sfnt_off000187df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x187DF 32696 bytes
SHA-256: 6c8b55de8a3259a8d594a8f513cf7fde3f75cf3cc8c6c025ad2efcf81f9ca6c1
font_02_sfnt_off0001d0b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D0B4 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176