Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f68d3313b4bbaca…

MALICIOUS

PDF

80.9 KB Created: 2021-03-14 18:48:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: f7f56dc604fd655a30537821b00a1a48 SHA-1: 214fc9e2b8905d9cb640140f4e0e7c0a1c6d2d96 SHA-256: 4f68d3313b4bbacace59d9b7b49884c2d72ba35e84b62e3fd19f938dd18f0f0b
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://bologen.ru/strik?utm_term=what+is+the+best+winegard+antenna PDF link annotation
    • https://cdn.sqhk.co/gukisafuw/dgjIggd/pixel_shon_adventure_2018.pdfIn PDF document text
    • http://vimabanu.sportsontheweb.net/68751634117.pdfIn PDF document text
    • https://cdn.sqhk.co/vunebapenuj/hcFijij/3184052150.pdfIn PDF document text
    • http://modezewop.mygamesonline.org/81825632062.pdfIn PDF document text
    • https://cdn.sqhk.co/tibakekavero/jPhc3gg/jelinafenifumop.pdfIn PDF document text
    • https://cdn.sqhk.co/topazawu/jbEDh8z/rowusoruxulusidebe.pdfIn PDF document text
    • https://cdn.sqhk.co/ditamozulipo/bZhjhj9/awe_telugu_movie_in_tamilrockers.pdfIn PDF document text
    • https://cdn.sqhk.co/nuxegaxujifo/XgfgjUZ/posape.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://b46c4cda-4951-41c0-816f-bbf02eee4d9b.filesusr.com/ugd/4ff992_166722dcc4814792bfa968e5e979317d.pdf?index=trueIn PDF document text
    • https://b998fa74-583e-446a-a2a7-67f41460fdb2.filesusr.com/ugd/e081f8_43e43ac3d1da41989a0828c6d70ebbed.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fizup/high_sea_saga_hatching_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/jivuxo/78319984818.pdfIn PDF document text
    • https://0a01f052-6ee6-4bfa-868d-d2e49373b03f.filesusr.com/ugd/55f640_1138913364804253ae28442aa791b633.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kewakuko/vexukamegamupe.pdfIn PDF document text
    • http://wejajesenopezoj.onlinewebshop.net/17548143322.pdfIn PDF document text
    • https://2e4d99de-9d37-4ce2-abd5-0bbccafdbe51.filesusr.com/ugd/33a2e4_3b39ad86db4c439aa68f88dbb0b46971.pdf?index=trueIn PDF document text
    • https://64395af2-4242-4e05-b369-c5cd74cd0025.filesusr.com/ugd/be19e1_7c90c4ae4d0a45ca97e99738fcf2933a.pdf?index=trueIn PDF document text
    • http://bamonoxo.onlinewebshop.net/fifth_third_bank_job_application_status.pdfIn PDF document text
    • https://de99c131-68bf-4271-bcef-cda292486844.filesusr.com/ugd/f5892c_12d4902912284c819007e25a50a07a96.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bupesejirijejus/14042312.pdfIn PDF document text
    • https://86146b48-cf95-488a-b5a0-22832f4589a6.filesusr.com/ugd/3b4eee_1abf864cd17b4455bc6859a5b185cf91.pdf?index=trueIn PDF document text
    • https://1e16f6d7-285b-4488-bf07-d3e24ac90e20.filesusr.com/ugd/417718_8264a56a05c9417b9beb1baeecef063b.pdf?index=trueIn 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_off0000f3c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C5 4976 bytes
SHA-256: f9eda810e5769b6c561ee2043ce5d380b04d1497a081bde797008c0e803bbc7c
font_01_sfnt_off000104aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104AA 10376 bytes
SHA-256: adb5cf11a266b01c0a08b79d92ab610f8076069414278efe1996c1ae37d4f8e9
font_02_sfnt_off0001282b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1282B 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f