Malicious PDF — malware analysis report

Static analysis result for SHA-256 e66caa7da0106425…

MALICIOUS

PDF

76.2 KB Created: 2021-03-04 07:34:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: a0519d2e15c1c62daacbc78adb14584e SHA-1: 9ad5f0f162724027875574d5fcb5e30533c9f2c5 SHA-256: e66caa7da0106425dbf00fce4302008e212f5a45d219fff06d59bb06d46de571
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, forming a link farm designed to direct users to various websites. The embedded URL and the PDF's structure suggest a phishing or SEO manipulation tactic, aiming to drive traffic to potentially malicious or scam-related content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://xezojetit.ru/award?keyword=how+to+connect+2+bluetooth+speaker+to+laptop PDF link annotation
    • https://rewumakabaw.weebly.com/uploads/1/3/4/8/134856880/gixusofi.pdfIn PDF document text
    • https://nalovitifa.weebly.com/uploads/1/3/4/6/134600698/vivorufomizedetifa.pdfIn PDF document text
    • https://cdn.sqhk.co/xejoverol/pNie0ij/classic_cars_for_sale_near_me_under_10000.pdfIn PDF document text
    • http://ziwigosopijulal.mygamesonline.org/how_to_get_filthy_rich_in_rising_asia_wikipedia.pdfIn PDF document text
    • http://bibuzikufaje.mygamesonline.org/how_to_type_greek_letters_in_excel.pdfIn PDF document text
    • https://poxatekegevu.weebly.com/uploads/1/3/4/7/134753674/4755580.pdfIn PDF document text
    • https://sesoramin.weebly.com/uploads/1/3/2/6/132681885/parixosir.pdfIn PDF document text
    • https://guvijubeb.weebly.com/uploads/1/3/5/3/135318684/motutunax.pdfIn PDF document text
    • https://cdn.sqhk.co/pejozujemu/PhhMH06/58948440891.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/purixifusipelid/84630128689.pdfIn PDF document text
    • https://s3.amazonaws.com/gotijejaj/ludofowugikezulikiji.pdfIn PDF document text
    • https://s3.amazonaws.com/wegemebufojafak/aranyakas_english.pdfIn PDF document text
    • http://mofikasim.epizy.com/etiology_of_rheumatoid_arthritis.pdfIn PDF document text
    • http://woxesuguve.epizy.com/vurudugezajivuzukebanifiw.pdfIn PDF document text
    • http://joxowosikaze.rf.gd/john_deere_2140_loader.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_off0000ed5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED5F 5408 bytes
SHA-256: acc55367cbab682179698fb15a5353157b39a58ac56464406b4c21d271e75a71
font_01_sfnt_off0000ffce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFCE 10428 bytes
SHA-256: 37e168262b7463ea1c3402218403d3866847303a8bb54d992de5053f4ec5b974

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